/**
 * Super simple wysiwyg editor v0.8.1
 * http://summernote.org/
 *
 * summernote.js
 * Copyright 2013-2015 Alan Hong. and other contributors
 * summernote may be freely distributed under the MIT license./
 *
 * Date: 2016-02-15T18:35Z
 */
(function(factory) {
    /* global define */
    if (typeof define === "function" && define.amd) {
        // AMD. Register as an anonymous module.
        define(["jquery"], factory);
    } else if (typeof module === "object" && module.exports) {
        // Node/CommonJS
        module.exports = factory(require("jquery"));
    } else {
        // Browser globals
        factory(window.jQuery);
    }
}(function($) {
    "use strict";

    /**
     * @class core.func
     *
     * func utils (for high-order func's arg)
     *
     * @singleton
     * @alternateClassName func
     */
    var func = (function() {
        var eq = function(itemA) {
            return function(itemB) {
                return itemA === itemB;
            };
        };

        var eq2 = function(itemA, itemB) {
            return itemA === itemB;
        };

        var peq2 = function(propName) {
            return function(itemA, itemB) {
                return itemA[propName] === itemB[propName];
            };
        };

        var ok = function() {
            return true;
        };

        var fail = function() {
            return false;
        };

        var not = function(f) {
            return function() {
                return !f.apply(f, arguments);
            };
        };

        var and = function(fA, fB) {
            return function(item) {
                return fA(item) && fB(item);
            };
        };

        var self = function(a) {
            return a;
        };

        var invoke = function(obj, method) {
            return function() {
                return obj[method].apply(obj, arguments);
            };
        };

        var idCounter = 0;

        /**
         * generate a globally-unique id
         *
         * @param {String} [prefix]
         */
        var uniqueId = function(prefix) {
            var id = ++idCounter + "";
            return prefix ? prefix + id : id;
        };

        /**
         * returns bnd (bounds) from rect
         *
         * - IE Compatibility Issue: http://goo.gl/sRLOAo
         * - Scroll Issue: http://goo.gl/sNjUc
         *
         * @param {Rect} rect
         * @return {Object} bounds
         * @return {Number} bounds.top
         * @return {Number} bounds.left
         * @return {Number} bounds.width
         * @return {Number} bounds.height
         */
        var rect2bnd = function(rect) {
            var $document = $(document);
            return {
                top: rect.top + $document.scrollTop(),
                left: rect.left + $document.scrollLeft(),
                width: rect.right - rect.left,
                height: rect.bottom - rect.top
            };
        };

        /**
         * returns a copy of the object where the keys have become the values and the values the keys.
         * @param {Object} obj
         * @return {Object}
         */
        var invertObject = function(obj) {
            var inverted = {};
            for (var key in obj) {
                if (obj.hasOwnProperty(key)) {
                    inverted[obj[key]] = key;
                }
            }
            return inverted;
        };

        /**
         * @param {String} namespace
         * @param {String} [prefix]
         * @return {String}
         */
        var namespaceToCamel = function(namespace, prefix) {
            prefix = prefix || "";
            return prefix +
                namespace.split(".").map(function(name) {
                    return name.substring(0, 1).toUpperCase() + name.substring(1);
                }).join("");
        };

        return {
            eq: eq,
            eq2: eq2,
            peq2: peq2,
            ok: ok,
            fail: fail,
            self: self,
            not: not,
            and: and,
            invoke: invoke,
            uniqueId: uniqueId,
            rect2bnd: rect2bnd,
            invertObject: invertObject,
            namespaceToCamel: namespaceToCamel
        };
    })();

    /**
     * @class core.list
     *
     * list utils
     *
     * @singleton
     * @alternateClassName list
     */
    var list = (function() {
        /**
         * returns the first item of an array.
         *
         * @param {Array} array
         */
        var head = function(array) {
            return array[0];
        };

        /**
         * returns the last item of an array.
         *
         * @param {Array} array
         */
        var last = function(array) {
            return array[array.length - 1];
        };

        /**
         * returns everything but the last entry of the array.
         *
         * @param {Array} array
         */
        var initial = function(array) {
            return array.slice(0, array.length - 1);
        };

        /**
         * returns the rest of the items in an array.
         *
         * @param {Array} array
         */
        var tail = function(array) {
            return array.slice(1);
        };

        /**
         * returns item of array
         */
        var find = function(array, pred) {
            for (var idx = 0, len = array.length; idx < len; idx ++) {
                var item = array[idx];
                if (pred(item)) {
                    return item;
                }
            }
        };

        /**
         * returns true if all of the values in the array pass the predicate truth test.
         */
        var all = function(array, pred) {
            for (var idx = 0, len = array.length; idx < len; idx ++) {
                if (!pred(array[idx])) {
                    return false;
                }
            }
            return true;
        };

        /**
         * returns index of item
         */
        var indexOf = function(array, item) {
            return $.inArray(item, array);
        };

        /**
         * returns true if the value is present in the list.
         */
        var contains = function(array, item) {
            return indexOf(array, item) !== -1;
        };

        /**
         * get sum from a list
         *
         * @param {Array} array - array
         * @param {Function} fn - iterator
         */
        var sum = function(array, fn) {
            fn = fn || func.self;
            return array.reduce(function(memo, v) {
                    return memo + fn(v);
                },
                0);
        };

        /**
         * returns a copy of the collection with array type.
         * @param {Collection} collection - collection eg) node.childNodes, ...
         */
        var from = function(collection) {
            var result = [], idx = -1, length = collection.length;
            while (++idx < length) {
                result[idx] = collection[idx];
            }
            return result;
        };

        /**
         * returns whether list is empty or not
         */
        var isEmpty = function(array) {
            return !array || !array.length;
        };

        /**
         * cluster elements by predicate function.
         *
         * @param {Array} array - array
         * @param {Function} fn - predicate function for cluster rule
         * @param {Array[]}
         */
        var clusterBy = function(array, fn) {
            if (!array.length) {
                return [];
            }
            var aTail = tail(array);
            return aTail.reduce(function(memo, v) {
                    var aLast = last(memo);
                    if (fn(last(aLast), v)) {
                        aLast[aLast.length] = v;
                    } else {
                        memo[memo.length] = [v];
                    }
                    return memo;
                },
                [[head(array)]]);
        };

        /**
         * returns a copy of the array with all falsy values removed
         *
         * @param {Array} array - array
         * @param {Function} fn - predicate function for cluster rule
         */
        var compact = function(array) {
            var aResult = [];
            for (var idx = 0, len = array.length; idx < len; idx ++) {
                if (array[idx]) {
                    aResult.push(array[idx]);
                }
            }
            return aResult;
        };

        /**
         * produces a duplicate-free version of the array
         *
         * @param {Array} array
         */
        var unique = function(array) {
            var results = [];

            for (var idx = 0, len = array.length; idx < len; idx ++) {
                if (!contains(results, array[idx])) {
                    results.push(array[idx]);
                }
            }

            return results;
        };

        /**
         * returns next item.
         * @param {Array} array
         */
        var next = function(array, item) {
            var idx = indexOf(array, item);
            if (idx === -1) {
                return null;
            }

            return array[idx + 1];
        };

        /**
         * returns prev item.
         * @param {Array} array
         */
        var prev = function(array, item) {
            var idx = indexOf(array, item);
            if (idx === -1) {
                return null;
            }

            return array[idx - 1];
        };

        return {
            head: head,
            last: last,
            initial: initial,
            tail: tail,
            prev: prev,
            next: next,
            find: find,
            contains: contains,
            all: all,
            sum: sum,
            from: from,
            isEmpty: isEmpty,
            clusterBy: clusterBy,
            compact: compact,
            unique: unique
        };
    })();

    var isSupportAmd = typeof define === "function" && define.amd;

    /**
     * returns whether font is installed or not.
     *
     * @param {String} fontName
     * @return {Boolean}
     */
    var isFontInstalled = function(fontName) {
        var testFontName = fontName === "Comic Sans MS" ? "Courier New" : "Comic Sans MS";
        var $tester = $("<div>").css({
            position: "absolute",
            left: "-9999px",
            top: "-9999px",
            fontSize: "200px"
        }).text("mmmmmmmmmwwwwwww").appendTo(document.body);

        var originalWidth = $tester.css("fontFamily", testFontName).width();
        var width = $tester.css("fontFamily", fontName + "," + testFontName).width();

        $tester.remove();

        return originalWidth !== width;
    };

    var userAgent = navigator.userAgent;
    var isMSIE = /MSIE|Trident/i.test(userAgent);
    var browserVersion;
    if (isMSIE) {
        var matches = /MSIE (\d+[.]\d+)/.exec(userAgent);
        if (matches) {
            browserVersion = parseFloat(matches[1]);
        }
        matches = /Trident\/.*rv:([0-9]{1,}[\.0-9]{0,})/.exec(userAgent);
        if (matches) {
            browserVersion = parseFloat(matches[1]);
        }
    }

    var isEdge = /Edge\/\d+/.test(userAgent);

    var hasCodeMirror = !!window.CodeMirror;
    if (!hasCodeMirror && isSupportAmd && require) {
        if (require.hasOwnProperty("resolve")) {
            try {
                // If CodeMirror can't be resolved, `require.resolve` will throw an
                // exception and `hasCodeMirror` won't be set to `true`.
                require.resolve("codemirror");
                hasCodeMirror = true;
            } catch (e) {
                hasCodeMirror = false;
            }
        } else if (require.hasOwnProperty("specified")) {
            hasCodeMirror = require.specified("codemirror");
        }
    }

    /**
     * @class core.agent
     *
     * Object which check platform and agent
     *
     * @singleton
     * @alternateClassName agent
     */
    var agent = {
        isMac: navigator.appVersion.indexOf("Mac") > -1,
        isMSIE: isMSIE,
        isEdge: isEdge,
        isFF: !isEdge && /firefox/i.test(userAgent),
        isPhantom: /PhantomJS/i.test(userAgent),
        isWebkit: !isEdge && /webkit/i.test(userAgent),
        isChrome: !isEdge && /chrome/i.test(userAgent),
        isSafari: !isEdge && /safari/i.test(userAgent),
        browserVersion: browserVersion,
        jqueryVersion: parseFloat($.fn.jquery),
        isSupportAmd: isSupportAmd,
        hasCodeMirror: hasCodeMirror,
        isFontInstalled: isFontInstalled,
        isW3CRangeSupport: !!document.createRange
    };


    var NBSP_CHAR = String.fromCharCode(160);
    var ZERO_WIDTH_NBSP_CHAR = "\ufeff";

    /**
     * @class core.dom
     *
     * Dom functions
     *
     * @singleton
     * @alternateClassName dom
     */
    var dom = (function() {
        /**
         * @method isEditable
         *
         * returns whether node is `note-editable` or not.
         *
         * @param {Node} node
         * @return {Boolean}
         */
        var isEditable = function(node) {
            return node && $(node).hasClass("note-editable");
        };

        /**
         * @method isControlSizing
         *
         * returns whether node is `note-control-sizing` or not.
         *
         * @param {Node} node
         * @return {Boolean}
         */
        var isControlSizing = function(node) {
            return node && $(node).hasClass("note-control-sizing");
        };

        /**
         * @method makePredByNodeName
         *
         * returns predicate which judge whether nodeName is same
         *
         * @param {String} nodeName
         * @return {Function}
         */
        var makePredByNodeName = function(nodeName) {
            nodeName = nodeName.toUpperCase();
            return function(node) {
                return node && node.nodeName.toUpperCase() === nodeName;
            };
        };

        /**
         * @method isText
         *
         *
         *
         * @param {Node} node
         * @return {Boolean} true if node's type is text(3)
         */
        var isText = function(node) {
            return node && node.nodeType === 3;
        };

        /**
         * @method isElement
         *
         *
         *
         * @param {Node} node
         * @return {Boolean} true if node's type is element(1)
         */
        var isElement = function(node) {
            return node && node.nodeType === 1;
        };

        /**
         * ex) br, col, embed, hr, img, input, ...
         * @see http://www.w3.org/html/wg/drafts/html/master/syntax.html#void-elements
         */
        var isVoid = function(node) {
            return node && /^BR|^IMG|^HR|^IFRAME|^BUTTON/.test(node.nodeName.toUpperCase());
        };

        var isPara = function(node) {
            if (isEditable(node)) {
                return false;
            }

            // Chrome(v31.0), FF(v25.0.1) use DIV for paragraph
            return node && /^DIV|^P|^LI|^H[1-7]/.test(node.nodeName.toUpperCase());
        };

        var isHeading = function(node) {
            return node && /^H[1-7]/.test(node.nodeName.toUpperCase());
        };

        var isPre = makePredByNodeName("PRE");

        var isLi = makePredByNodeName("LI");

        var isPurePara = function(node) {
            return isPara(node) && !isLi(node);
        };

        var isTable = makePredByNodeName("TABLE");

        var isInline = function(node) {
            return !isBodyContainer(node) &&
                !isList(node) &&
                !isHr(node) &&
                !isPara(node) &&
                !isTable(node) &&
                !isBlockquote(node);
        };

        var isList = function(node) {
            return node && /^UL|^OL/.test(node.nodeName.toUpperCase());
        };

        var isHr = makePredByNodeName("HR");

        var isCell = function(node) {
            return node && /^TD|^TH/.test(node.nodeName.toUpperCase());
        };

        var isBlockquote = makePredByNodeName("BLOCKQUOTE");

        var isBodyContainer = function(node) {
            return isCell(node) || isBlockquote(node) || isEditable(node);
        };

        var isAnchor = makePredByNodeName("A");

        var isParaInline = function(node) {
            return isInline(node) && !!ancestor(node, isPara);
        };

        var isBodyInline = function(node) {
            return isInline(node) && !ancestor(node, isPara);
        };

        var isBody = makePredByNodeName("BODY");

        /**
         * returns whether nodeB is closest sibling of nodeA
         *
         * @param {Node} nodeA
         * @param {Node} nodeB
         * @return {Boolean}
         */
        var isClosestSibling = function(nodeA, nodeB) {
            return nodeA.nextSibling === nodeB ||
                nodeA.previousSibling === nodeB;
        };

        /**
         * returns array of closest siblings with node
         *
         * @param {Node} node
         * @param {function} [pred] - predicate function
         * @return {Node[]}
         */
        var withClosestSiblings = function(node, pred) {
            pred = pred || func.ok;

            var siblings = [];
            if (node.previousSibling && pred(node.previousSibling)) {
                siblings.push(node.previousSibling);
            }
            siblings.push(node);
            if (node.nextSibling && pred(node.nextSibling)) {
                siblings.push(node.nextSibling);
            }
            return siblings;
        };

        /**
         * blank HTML for cursor position
         * - [workaround] old IE only works with &nbsp;
         * - [workaround] IE11 and other browser works with bogus br
         */
        var blankHTML = agent.isMSIE && agent.browserVersion < 11 ? "&nbsp;" : "<br>";

        /**
         * @method nodeLength
         *
         * returns #text's text size or element's childNodes size
         *
         * @param {Node} node
         */
        var nodeLength = function(node) {
            if (isText(node)) {
                return node.nodeValue.length;
            }

            return node.childNodes.length;
        };

        /**
         * returns whether node is empty or not.
         *
         * @param {Node} node
         * @return {Boolean}
         */
        var isEmpty = function(node) {
            var len = nodeLength(node);

            if (len === 0) {
                return true;
            } else if (!isText(node) && len === 1 && node.innerHTML === blankHTML) {
                // ex) <p><br></p>, <span><br></span>
                return true;
            } else if (list.all(node.childNodes, isText) && node.innerHTML === "") {
                // ex) <p></p>, <span></span>
                return true;
            }

            return false;
        };

        /**
         * padding blankHTML if node is empty (for cursor position)
         */
        var paddingBlankHTML = function(node) {
            if (!isVoid(node) && !nodeLength(node)) {
                node.innerHTML = blankHTML;
            }
        };

        /**
         * find nearest ancestor predicate hit
         *
         * @param {Node} node
         * @param {Function} pred - predicate function
         */
        var ancestor = function(node, pred) {
            while (node) {
                if (pred(node)) {
                    return node;
                }
                if (isEditable(node)) {
                    break;
                }

                node = node.parentNode;
            }
            return null;
        };

        /**
         * find nearest ancestor only single child blood line and predicate hit
         *
         * @param {Node} node
         * @param {Function} pred - predicate function
         */
        var singleChildAncestor = function(node, pred) {
            node = node.parentNode;

            while (node) {
                if (nodeLength(node) !== 1) {
                    break;
                }
                if (pred(node)) {
                    return node;
                }
                if (isEditable(node)) {
                    break;
                }

                node = node.parentNode;
            }
            return null;
        };

        /**
         * returns new array of ancestor nodes (until predicate hit).
         *
         * @param {Node} node
         * @param {Function} [optional] pred - predicate function
         */
        var listAncestor = function(node, pred) {
            pred = pred || func.fail;

            var ancestors = [];
            ancestor(node,
                function(el) {
                    if (!isEditable(el)) {
                        ancestors.push(el);
                    }

                    return pred(el);
                });
            return ancestors;
        };

        /**
         * find farthest ancestor predicate hit
         */
        var lastAncestor = function(node, pred) {
            var ancestors = listAncestor(node);
            return list.last(ancestors.filter(pred));
        };

        /**
         * returns common ancestor node between two nodes.
         *
         * @param {Node} nodeA
         * @param {Node} nodeB
         */
        var commonAncestor = function(nodeA, nodeB) {
            var ancestors = listAncestor(nodeA);
            for (var n = nodeB; n; n = n.parentNode) {
                if ($.inArray(n, ancestors) > -1) {
                    return n;
                }
            }
            return null; // difference document area
        };

        /**
         * listing all previous siblings (until predicate hit).
         *
         * @param {Node} node
         * @param {Function} [optional] pred - predicate function
         */
        var listPrev = function(node, pred) {
            pred = pred || func.fail;

            var nodes = [];
            while (node) {
                if (pred(node)) {
                    break;
                }
                nodes.push(node);
                node = node.previousSibling;
            }
            return nodes;
        };

        /**
         * listing next siblings (until predicate hit).
         *
         * @param {Node} node
         * @param {Function} [pred] - predicate function
         */
        var listNext = function(node, pred) {
            pred = pred || func.fail;

            var nodes = [];
            while (node) {
                if (pred(node)) {
                    break;
                }
                nodes.push(node);
                node = node.nextSibling;
            }
            return nodes;
        };

        /**
         * listing descendant nodes
         *
         * @param {Node} node
         * @param {Function} [pred] - predicate function
         */
        var listDescendant = function(node, pred) {
            var descendants = [];
            pred = pred || func.ok;

            // start DFS(depth first search) with node
            (function fnWalk(current) {
                if (node !== current && pred(current)) {
                    descendants.push(current);
                }
                for (var idx = 0, len = current.childNodes.length; idx < len; idx++) {
                    fnWalk(current.childNodes[idx]);
                }
            })(node);

            return descendants;
        };

        /**
         * wrap node with new tag.
         *
         * @param {Node} node
         * @param {Node} tagName of wrapper
         * @return {Node} - wrapper
         */
        var wrap = function(node, wrapperName) {
            var parent = node.parentNode;
            var wrapper = $("<" + wrapperName + ">")[0];

            parent.insertBefore(wrapper, node);
            wrapper.appendChild(node);

            return wrapper;
        };

        /**
         * insert node after preceding
         *
         * @param {Node} node
         * @param {Node} preceding - predicate function
         */
        var insertAfter = function(node, preceding) {
            var next = preceding.nextSibling, parent = preceding.parentNode;
            if (next) {
                parent.insertBefore(node, next);
            } else {
                parent.appendChild(node);
            }
            return node;
        };

        /**
         * append elements.
         *
         * @param {Node} node
         * @param {Collection} aChild
         */
        var appendChildNodes = function(node, aChild) {
            $.each(aChild,
                function(idx, child) {
                    node.appendChild(child);
                });
            return node;
        };

        /**
         * returns whether boundaryPoint is left edge or not.
         *
         * @param {BoundaryPoint} point
         * @return {Boolean}
         */
        var isLeftEdgePoint = function(point) {
            return point.offset === 0;
        };

        /**
         * returns whether boundaryPoint is right edge or not.
         *
         * @param {BoundaryPoint} point
         * @return {Boolean}
         */
        var isRightEdgePoint = function(point) {
            return point.offset === nodeLength(point.node);
        };

        /**
         * returns whether boundaryPoint is edge or not.
         *
         * @param {BoundaryPoint} point
         * @return {Boolean}
         */
        var isEdgePoint = function(point) {
            return isLeftEdgePoint(point) || isRightEdgePoint(point);
        };

        /**
         * returns whether node is left edge of ancestor or not.
         *
         * @param {Node} node
         * @param {Node} ancestor
         * @return {Boolean}
         */
        var isLeftEdgeOf = function(node, ancestor) {
            while (node && node !== ancestor) {
                if (position(node) !== 0) {
                    return false;
                }
                node = node.parentNode;
            }

            return true;
        };

        /**
         * returns whether node is right edge of ancestor or not.
         *
         * @param {Node} node
         * @param {Node} ancestor
         * @return {Boolean}
         */
        var isRightEdgeOf = function(node, ancestor) {
            while (node && node !== ancestor) {
                if (position(node) !== nodeLength(node.parentNode) - 1) {
                    return false;
                }
                node = node.parentNode;
            }

            return true;
        };

        /**
         * returns whether point is left edge of ancestor or not.
         * @param {BoundaryPoint} point
         * @param {Node} ancestor
         * @return {Boolean}
         */
        var isLeftEdgePointOf = function(point, ancestor) {
            return isLeftEdgePoint(point) && isLeftEdgeOf(point.node, ancestor);
        };

        /**
         * returns whether point is right edge of ancestor or not.
         * @param {BoundaryPoint} point
         * @param {Node} ancestor
         * @return {Boolean}
         */
        var isRightEdgePointOf = function(point, ancestor) {
            return isRightEdgePoint(point) && isRightEdgeOf(point.node, ancestor);
        };

        /**
         * returns offset from parent.
         *
         * @param {Node} node
         */
        var position = function(node) {
            var offset = 0;
            while ((node = node.previousSibling)) {
                offset += 1;
            }
            return offset;
        };

        var hasChildren = function(node) {
            return !!(node && node.childNodes && node.childNodes.length);
        };

        /**
         * returns previous boundaryPoint
         *
         * @param {BoundaryPoint} point
         * @param {Boolean} isSkipInnerOffset
         * @return {BoundaryPoint}
         */
        var prevPoint = function(point, isSkipInnerOffset) {
            var node, offset;

            if (point.offset === 0) {
                if (isEditable(point.node)) {
                    return null;
                }

                node = point.node.parentNode;
                offset = position(point.node);
            } else if (hasChildren(point.node)) {
                node = point.node.childNodes[point.offset - 1];
                offset = nodeLength(node);
            } else {
                node = point.node;
                offset = isSkipInnerOffset ? 0 : point.offset - 1;
            }

            return {
                node: node,
                offset: offset
            };
        };

        /**
         * returns next boundaryPoint
         *
         * @param {BoundaryPoint} point
         * @param {Boolean} isSkipInnerOffset
         * @return {BoundaryPoint}
         */
        var nextPoint = function(point, isSkipInnerOffset) {
            var node, offset;

            if (nodeLength(point.node) === point.offset) {
                if (isEditable(point.node)) {
                    return null;
                }

                node = point.node.parentNode;
                offset = position(point.node) + 1;
            } else if (hasChildren(point.node)) {
                node = point.node.childNodes[point.offset];
                offset = 0;
            } else {
                node = point.node;
                offset = isSkipInnerOffset ? nodeLength(point.node) : point.offset + 1;
            }

            return {
                node: node,
                offset: offset
            };
        };

        /**
         * returns whether pointA and pointB is same or not.
         *
         * @param {BoundaryPoint} pointA
         * @param {BoundaryPoint} pointB
         * @return {Boolean}
         */
        var isSamePoint = function(pointA, pointB) {
            return pointA.node === pointB.node && pointA.offset === pointB.offset;
        };

        /**
         * returns whether point is visible (can set cursor) or not.
         * 
         * @param {BoundaryPoint} point
         * @return {Boolean}
         */
        var isVisiblePoint = function(point) {
            if (isText(point.node) || !hasChildren(point.node) || isEmpty(point.node)) {
                return true;
            }

            var leftNode = point.node.childNodes[point.offset - 1];
            var rightNode = point.node.childNodes[point.offset];
            if ((!leftNode || isVoid(leftNode)) && (!rightNode || isVoid(rightNode))) {
                return true;
            }

            return false;
        };

        /**
         * @method prevPointUtil
         *
         * @param {BoundaryPoint} point
         * @param {Function} pred
         * @return {BoundaryPoint}
         */
        var prevPointUntil = function(point, pred) {
            while (point) {
                if (pred(point)) {
                    return point;
                }

                point = prevPoint(point);
            }

            return null;
        };

        /**
         * @method nextPointUntil
         *
         * @param {BoundaryPoint} point
         * @param {Function} pred
         * @return {BoundaryPoint}
         */
        var nextPointUntil = function(point, pred) {
            while (point) {
                if (pred(point)) {
                    return point;
                }

                point = nextPoint(point);
            }

            return null;
        };

        /**
         * returns whether point has character or not.
         *
         * @param {Point} point
         * @return {Boolean}
         */
        var isCharPoint = function(point) {
            if (!isText(point.node)) {
                return false;
            }

            var ch = point.node.nodeValue.charAt(point.offset - 1);
            return ch && (ch !== " " && ch !== NBSP_CHAR);
        };

        /**
         * @method walkPoint
         *
         * @param {BoundaryPoint} startPoint
         * @param {BoundaryPoint} endPoint
         * @param {Function} handler
         * @param {Boolean} isSkipInnerOffset
         */
        var walkPoint = function(startPoint, endPoint, handler, isSkipInnerOffset) {
            var point = startPoint;

            while (point) {
                handler(point);

                if (isSamePoint(point, endPoint)) {
                    break;
                }

                var isSkipOffset = isSkipInnerOffset &&
                    startPoint.node !== point.node &&
                    endPoint.node !== point.node;
                point = nextPoint(point, isSkipOffset);
            }
        };

        /**
         * @method makeOffsetPath
         *
         * return offsetPath(array of offset) from ancestor
         *
         * @param {Node} ancestor - ancestor node
         * @param {Node} node
         */
        var makeOffsetPath = function(ancestor, node) {
            var ancestors = listAncestor(node, func.eq(ancestor));
            return ancestors.map(position).reverse();
        };

        /**
         * @method fromOffsetPath
         *
         * return element from offsetPath(array of offset)
         *
         * @param {Node} ancestor - ancestor node
         * @param {array} offsets - offsetPath
         */
        var fromOffsetPath = function(ancestor, offsets) {
            var current = ancestor;
            for (var i = 0, len = offsets.length; i < len; i++) {
                if (current.childNodes.length <= offsets[i]) {
                    current = current.childNodes[current.childNodes.length - 1];
                } else {
                    current = current.childNodes[offsets[i]];
                }
            }
            return current;
        };

        /**
         * @method splitNode
         *
         * split element or #text
         *
         * @param {BoundaryPoint} point
         * @param {Object} [options]
         * @param {Boolean} [options.isSkipPaddingBlankHTML] - default: false
         * @param {Boolean} [options.isNotSplitEdgePoint] - default: false
         * @return {Node} right node of boundaryPoint
         */
        var splitNode = function(point, options) {
            var isSkipPaddingBlankHTML = options && options.isSkipPaddingBlankHTML;
            var isNotSplitEdgePoint = options && options.isNotSplitEdgePoint;

            // edge case
            if (isEdgePoint(point) && (isText(point.node) || isNotSplitEdgePoint)) {
                if (isLeftEdgePoint(point)) {
                    return point.node;
                } else if (isRightEdgePoint(point)) {
                    return point.node.nextSibling;
                }
            }

            // split #text
            if (isText(point.node)) {
                return point.node.splitText(point.offset);
            } else {
                var childNode = point.node.childNodes[point.offset];
                var clone = insertAfter(point.node.cloneNode(false), point.node);
                appendChildNodes(clone, listNext(childNode));

                if (!isSkipPaddingBlankHTML) {
                    paddingBlankHTML(point.node);
                    paddingBlankHTML(clone);
                }

                return clone;
            }
        };

        /**
         * @method splitTree
         *
         * split tree by point
         *
         * @param {Node} root - split root
         * @param {BoundaryPoint} point
         * @param {Object} [options]
         * @param {Boolean} [options.isSkipPaddingBlankHTML] - default: false
         * @param {Boolean} [options.isNotSplitEdgePoint] - default: false
         * @return {Node} right node of boundaryPoint
         */
        var splitTree = function(root, point, options) {
            // ex) [#text, <span>, <p>]
            var ancestors = listAncestor(point.node, func.eq(root));

            if (!ancestors.length) {
                return null;
            } else if (ancestors.length === 1) {
                return splitNode(point, options);
            }

            return ancestors.reduce(function(node, parent) {
                if (node === point.node) {
                    node = splitNode(point, options);
                }

                return splitNode({
                        node: parent,
                        offset: node ? dom.position(node) : nodeLength(parent)
                    },
                    options);
            });
        };

        /**
         * split point
         *
         * @param {Point} point
         * @param {Boolean} isInline
         * @return {Object}
         */
        var splitPoint = function(point, isInline) {
            // find splitRoot, container
            //  - inline: splitRoot is a child of paragraph
            //  - block: splitRoot is a child of bodyContainer
            var pred = isInline ? isPara : isBodyContainer;
            var ancestors = listAncestor(point.node, pred);
            var topAncestor = list.last(ancestors) || point.node;

            var splitRoot, container;
            if (pred(topAncestor)) {
                splitRoot = ancestors[ancestors.length - 2];
                container = topAncestor;
            } else {
                splitRoot = topAncestor;
                container = splitRoot.parentNode;
            }

            // if splitRoot is exists, split with splitTree
            var pivot = splitRoot &&
                splitTree(splitRoot,
                    point,
                    {
                        isSkipPaddingBlankHTML: isInline,
                        isNotSplitEdgePoint: isInline
                    });

            // if container is point.node, find pivot with point.offset
            if (!pivot && container === point.node) {
                pivot = point.node.childNodes[point.offset];
            }

            return {
                rightNode: pivot,
                container: container
            };
        };

        var create = function(nodeName) {
            return document.createElement(nodeName);
        };

        var createText = function(text) {
            return document.createTextNode(text);
        };

        /**
         * @method remove
         *
         * remove node, (isRemoveChild: remove child or not)
         *
         * @param {Node} node
         * @param {Boolean} isRemoveChild
         */
        var remove = function(node, isRemoveChild) {
            if (!node || !node.parentNode) {
                return;
            }
            if (node.removeNode) {
                return node.removeNode(isRemoveChild);
            }

            var parent = node.parentNode;
            if (!isRemoveChild) {
                var nodes = [];
                var i, len;
                for (i = 0, len = node.childNodes.length; i < len; i++) {
                    nodes.push(node.childNodes[i]);
                }

                for (i = 0, len = nodes.length; i < len; i++) {
                    parent.insertBefore(nodes[i], node);
                }
            }

            parent.removeChild(node);
        };

        /**
         * @method removeWhile
         *
         * @param {Node} node
         * @param {Function} pred
         */
        var removeWhile = function(node, pred) {
            while (node) {
                if (isEditable(node) || !pred(node)) {
                    break;
                }

                var parent = node.parentNode;
                remove(node);
                node = parent;
            }
        };

        /**
         * @method replace
         *
         * replace node with provided nodeName
         *
         * @param {Node} node
         * @param {String} nodeName
         * @return {Node} - new node
         */
        var replace = function(node, nodeName) {
            if (node.nodeName.toUpperCase() === nodeName.toUpperCase()) {
                return node;
            }

            var newNode = create(nodeName);

            if (node.style.cssText) {
                newNode.style.cssText = node.style.cssText;
            }

            appendChildNodes(newNode, list.from(node.childNodes));
            insertAfter(newNode, node);
            remove(node);

            return newNode;
        };

        var isTextarea = makePredByNodeName("TEXTAREA");

        /**
         * @param {jQuery} $node
         * @param {Boolean} [stripLinebreaks] - default: false
         */
        var value = function($node, stripLinebreaks) {
            var val = isTextarea($node[0]) ? $node.val() : $node.html();
            if (stripLinebreaks) {
                return val.replace(/[\n\r]/g, "");
            }
            return val;
        };

        /**
         * @method html
         *
         * get the HTML contents of node
         *
         * @param {jQuery} $node
         * @param {Boolean} [isNewlineOnBlock]
         */
        var html = function($node, isNewlineOnBlock) {
            var markup = value($node);

            if (isNewlineOnBlock) {
                var regexTag = /<(\/?)(\b(?!!)[^>\s]*)(.*?)(\s*\/?>)/g;
                markup = markup.replace(regexTag,
                    function(match, endSlash, name) {
                        name = name.toUpperCase();
                        var isEndOfInlineContainer = /^DIV|^TD|^TH|^P|^LI|^H[1-7]/.test(name) &&
                            !!endSlash;
                        var isBlockNode = /^BLOCKQUOTE|^TABLE|^TBODY|^TR|^HR|^UL|^OL/.test(name);

                        return match + ((isEndOfInlineContainer || isBlockNode) ? "\n" : "");
                    });
                markup = $.trim(markup);
            }

            return markup;
        };

        var posFromPlaceholder = function(placeholder) {
            var $placeholder = $(placeholder);
            var pos = $placeholder.offset();
            var height = $placeholder.outerHeight(true); // include margin

            return {
                left: pos.left,
                top: pos.top + height
            };
        };

        var attachEvents = function($node, events) {
            Object.keys(events).forEach(function(key) {
                $node.on(key, events[key]);
            });
        };

        var detachEvents = function($node, events) {
            Object.keys(events).forEach(function(key) {
                $node.off(key, events[key]);
            });
        };

        return {
            /** @property {String} NBSP_CHAR */
            NBSP_CHAR: NBSP_CHAR,
            /** @property {String} ZERO_WIDTH_NBSP_CHAR */
            ZERO_WIDTH_NBSP_CHAR: ZERO_WIDTH_NBSP_CHAR,
            /** @property {String} blank */
            blank: blankHTML,
            /** @property {String} emptyPara */
            emptyPara: "<p>" + blankHTML + "</p>",
            makePredByNodeName: makePredByNodeName,
            isEditable: isEditable,
            isControlSizing: isControlSizing,
            isText: isText,
            isElement: isElement,
            isVoid: isVoid,
            isPara: isPara,
            isPurePara: isPurePara,
            isHeading: isHeading,
            isInline: isInline,
            isBlock: func.not(isInline),
            isBodyInline: isBodyInline,
            isBody: isBody,
            isParaInline: isParaInline,
            isPre: isPre,
            isList: isList,
            isTable: isTable,
            isCell: isCell,
            isBlockquote: isBlockquote,
            isBodyContainer: isBodyContainer,
            isAnchor: isAnchor,
            isDiv: makePredByNodeName("DIV"),
            isLi: isLi,
            isBR: makePredByNodeName("BR"),
            isSpan: makePredByNodeName("SPAN"),
            isB: makePredByNodeName("B"),
            isU: makePredByNodeName("U"),
            isS: makePredByNodeName("S"),
            isI: makePredByNodeName("I"),
            isImg: makePredByNodeName("IMG"),
            isTextarea: isTextarea,
            isEmpty: isEmpty,
            isEmptyAnchor: func.and(isAnchor, isEmpty),
            isClosestSibling: isClosestSibling,
            withClosestSiblings: withClosestSiblings,
            nodeLength: nodeLength,
            isLeftEdgePoint: isLeftEdgePoint,
            isRightEdgePoint: isRightEdgePoint,
            isEdgePoint: isEdgePoint,
            isLeftEdgeOf: isLeftEdgeOf,
            isRightEdgeOf: isRightEdgeOf,
            isLeftEdgePointOf: isLeftEdgePointOf,
            isRightEdgePointOf: isRightEdgePointOf,
            prevPoint: prevPoint,
            nextPoint: nextPoint,
            isSamePoint: isSamePoint,
            isVisiblePoint: isVisiblePoint,
            prevPointUntil: prevPointUntil,
            nextPointUntil: nextPointUntil,
            isCharPoint: isCharPoint,
            walkPoint: walkPoint,
            ancestor: ancestor,
            singleChildAncestor: singleChildAncestor,
            listAncestor: listAncestor,
            lastAncestor: lastAncestor,
            listNext: listNext,
            listPrev: listPrev,
            listDescendant: listDescendant,
            commonAncestor: commonAncestor,
            wrap: wrap,
            insertAfter: insertAfter,
            appendChildNodes: appendChildNodes,
            position: position,
            hasChildren: hasChildren,
            makeOffsetPath: makeOffsetPath,
            fromOffsetPath: fromOffsetPath,
            splitTree: splitTree,
            splitPoint: splitPoint,
            create: create,
            createText: createText,
            remove: remove,
            removeWhile: removeWhile,
            replace: replace,
            html: html,
            value: value,
            posFromPlaceholder: posFromPlaceholder,
            attachEvents: attachEvents,
            detachEvents: detachEvents
        };
    })();

    /**
     * @param {jQuery} $note
     * @param {Object} options
     * @return {Context}
     */
    var Context = function($note, options) {
        var self = this;

        var ui = $.summernote.ui;
        this.memos = {};
        this.modules = {};
        this.layoutInfo = {};
        this.options = options;

        /**
         * create layout and initialize modules and other resources
         */
        this.initialize = function() {
            this.layoutInfo = ui.createLayout($note, options);
            this._initialize();
            $note.hide();
            return this;
        };

        /**
         * destroy modules and other resources and remove layout
         */
        this.destroy = function() {
            this._destroy();
            $note.removeData("summernote");
            ui.removeLayout($note, this.layoutInfo);
        };

        /**
         * destory modules and other resources and initialize it again
         */
        this.reset = function() {
            var disabled = self.isDisabled();
            this.code(dom.emptyPara);
            this._destroy();
            this._initialize();

            if (disabled) {
                self.disable();
            }
        };

        this._initialize = function() {
            // add optional buttons
            var buttons = $.extend({}, this.options.buttons);
            Object.keys(buttons).forEach(function(key) {
                self.memo("button." + key, buttons[key]);
            });

            var modules = $.extend({}, this.options.modules, $.summernote.plugins || {});

            // add and initialize modules
            Object.keys(modules).forEach(function(key) {
                self.module(key, modules[key], true);
            });

            Object.keys(this.modules).forEach(function(key) {
                self.initializeModule(key);
            });
        };

        this._destroy = function() {
            // destroy modules with reversed order
            Object.keys(this.modules).reverse().forEach(function(key) {
                self.removeModule(key);
            });

            Object.keys(this.memos).forEach(function(key) {
                self.removeMemo(key);
            });
        };

        this.code = function(html) {
            var isActivated = this.invoke("codeview.isActivated");

            if (html === undefined) {
                this.invoke("codeview.sync");
                return isActivated ? this.layoutInfo.codable.val() : this.layoutInfo.editable.html();
            } else {
                if (isActivated) {
                    this.layoutInfo.codable.val(html);
                } else {
                    this.layoutInfo.editable.html(html);
                }
                $note.val(html);
                this.triggerEvent("change", html);
            }
        };

        this.isDisabled = function() {
            return this.layoutInfo.editable.attr("contenteditable") === "false";
        };

        this.enable = function() {
            this.layoutInfo.editable.attr("contenteditable", true);
            this.invoke("toolbar.activate", true);
        };

        this.disable = function() {
            // close codeview if codeview is opend
            if (this.invoke("codeview.isActivated")) {
                this.invoke("codeview.deactivate");
            }
            this.layoutInfo.editable.attr("contenteditable", false);
            this.invoke("toolbar.deactivate", true);
        };

        this.triggerEvent = function() {
            var namespace = list.head(arguments);
            var args = list.tail(list.from(arguments));

            var callback = this.options.callbacks[func.namespaceToCamel(namespace, "on")];
            if (callback) {
                callback.apply($note[0], args);
            }
            $note.trigger("summernote." + namespace, args);
        };

        this.initializeModule = function(key) {
            var module = this.modules[key];
            module.shouldInitialize = module.shouldInitialize || func.ok;
            if (!module.shouldInitialize()) {
                return;
            }

            // initialize module
            if (module.initialize) {
                module.initialize();
            }

            // attach events
            if (module.events) {
                dom.attachEvents($note, module.events);
            }
        };

        this.module = function(key, ModuleClass, withoutIntialize) {
            if (arguments.length === 1) {
                return this.modules[key];
            }

            this.modules[key] = new ModuleClass(this);

            if (!withoutIntialize) {
                this.initializeModule(key);
            }
        };

        this.removeModule = function(key) {
            var module = this.modules[key];
            if (module.shouldInitialize()) {
                if (module.events) {
                    dom.detachEvents($note, module.events);
                }

                if (module.destroy) {
                    module.destroy();
                }
            }

            delete this.modules[key];
        };

        this.memo = function(key, obj) {
            if (arguments.length === 1) {
                return this.memos[key];
            }
            this.memos[key] = obj;
        };

        this.removeMemo = function(key) {
            if (this.memos[key] && this.memos[key].destroy) {
                this.memos[key].destroy();
            }

            delete this.memos[key];
        };

        this.createInvokeHandler = function(namespace, value) {
            return function(event) {
                event.preventDefault();
                self.invoke(namespace, value || $(event.target).closest("[data-value]").data("value"));
            };
        };

        this.invoke = function() {
            var namespace = list.head(arguments);
            var args = list.tail(list.from(arguments));

            var splits = namespace.split(".");
            var hasSeparator = splits.length > 1;
            var moduleName = hasSeparator && list.head(splits);
            var methodName = hasSeparator ? list.last(splits) : list.head(splits);

            var module = this.modules[moduleName || "editor"];
            if (!moduleName && this[methodName]) {
                return this[methodName].apply(this, args);
            } else if (module && module[methodName] && module.shouldInitialize()) {
                return module[methodName].apply(module, args);
            }
        };

        return this.initialize();
    };

    $.fn.extend({
        /**
         * Summernote API
         *
         * @param {Object|String}
         * @return {this}
         */
        summernote: function() {
            var type = $.type(list.head(arguments));
            var isExternalAPICalled = type === "string";
            var hasInitOptions = type === "object";

            var options = hasInitOptions ? list.head(arguments) : {};

            options = $.extend({}, $.summernote.options, options);
            options.langInfo = $.extend(true, {}, $.summernote.lang["en-US"], $.summernote.lang[options.lang]);

            this.each(function(idx, note) {
                var $note = $(note);
                if (!$note.data("summernote")) {
                    var context = new Context($note, options);
                    $note.data("summernote", context);
                    $note.data("summernote").triggerEvent("init", context.layoutInfo);
                }
            });

            var $note = this.first();
            if ($note.length) {
                var context = $note.data("summernote");
                if (isExternalAPICalled) {
                    return context.invoke.apply(context, list.from(arguments));
                } else if (options.focus) {
                    context.invoke("editor.focus");
                }
            }

            return this;
        }
    });


    var Renderer = function(markup, children, options, callback) {
        this.render = function($parent) {
            var $node = $(markup);

            if (options && options.contents) {
                $node.html(options.contents);
            }

            if (options && options.className) {
                $node.addClass(options.className);
            }

            if (options && options.data) {
                $.each(options.data,
                    function(k, v) {
                        $node.attr("data-" + k, v);
                    });
            }

            if (options && options.click) {
                $node.on("click", options.click);
            }

            if (children) {
                var $container = $node.find(".note-children-container");
                children.forEach(function(child) {
                    child.render($container.length ? $container : $node);
                });
            }

            if (callback) {
                callback($node, options);
            }

            if (options && options.callback) {
                options.callback($node);
            }

            if ($parent) {
                $parent.append($node);
            }

            return $node;
        };
    };

    var renderer = {
        create: function(markup, callback) {
            return function() {
                var children = $.isArray(arguments[0]) ? arguments[0] : [];
                var options = typeof arguments[1] === "object" ? arguments[1] : arguments[0];
                if (options && options.children) {
                    children = options.children;
                }
                return new Renderer(markup, children, options, callback);
            };
        }
    };

    var editor = renderer.create('<div class="note-editor note-frame panel panel-default"/>');
    var toolbar = renderer.create('<div class="note-toolbar panel-heading"/>');
    var editingArea = renderer.create('<div class="note-editing-area"/>');
    var codable = renderer.create('<textarea class="note-codable"/>');
    var editable = renderer.create('<div class="note-editable panel-body" contentEditable="true"/>');
    var statusbar = renderer.create([
        '<div class="note-statusbar">',
        '  <div class="note-resizebar">',
        '    <div class="note-icon-bar"/>',
        '    <div class="note-icon-bar"/>',
        '    <div class="note-icon-bar"/>',
        "  </div>",
        "</div>"
    ].join(""));

    var airEditor = renderer.create('<div class="note-editor"/>');
    var airEditable = renderer.create('<div class="note-editable" contentEditable="true"/>');

    var buttonGroup = renderer.create('<div class="note-btn-group btn-group">');
    var button = renderer.create('<button type="button" class="note-btn btn btn-default btn-sm">',
        function($node, options) {
            if (options && options.tooltip) {
                $node.attr({
                    title: options.tooltip
                }).tooltip({
                    container: "body",
                    trigger: "hover",
                    placement: "bottom"
                });
            }
        });

    var dropdown = renderer.create('<div class="dropdown-menu">',
        function($node, options) {
            var markup = $.isArray(options.items)
                ? options.items.map(function(item) {
                    var value = (typeof item === "string") ? item : (item.value || "");
                    var content = options.template ? options.template(item) : item;
                    return '<li><a href="#" data-value="' + value + '">' + content + "</a></li>";
                }).join("")
                : options.items;

            $node.html(markup);
        });

    var dropdownCheck = renderer.create('<div class="dropdown-menu note-check">',
        function($node, options) {
            var markup = $.isArray(options.items)
                ? options.items.map(function(item) {
                    var value = (typeof item === "string") ? item : (item.value || "");
                    var content = options.template ? options.template(item) : item;
                    return '<li><a href="#" data-value="' +
                        value +
                        '">' +
                        icon(options.checkClassName) +
                        " " +
                        content +
                        "</a></li>";
                }).join("")
                : options.items;
            $node.html(markup);
        });

    var palette = renderer.create('<div class="note-color-palette"/>',
        function($node, options) {
            var contents = [];
            for (var row = 0, rowSize = options.colors.length; row < rowSize; row++) {
                var eventName = options.eventName;
                var colors = options.colors[row];
                var buttons = [];
                for (var col = 0, colSize = colors.length; col < colSize; col++) {
                    var color = colors[col];
                    buttons.push([
                        '<button type="button" class="note-color-btn"',
                        'style="background-color:', color, '" ',
                        'data-event="', eventName, '" ',
                        'data-value="', color, '" ',
                        'title="', color, '" ',
                        'data-toggle="button" tabindex="-1"></button>'
                    ].join(""));
                }
                contents.push('<div class="note-color-row">' + buttons.join("") + "</div>");
            }
            $node.html(contents.join(""));

            $node.find(".note-color-btn").tooltip({
                container: "body",
                trigger: "hover",
                placement: "bottom"
            });
        });

    var dialog = renderer.create('<div class="modal" aria-hidden="false" tabindex="-1"/>',
        function($node, options) {
            if (options.fade) {
                $node.addClass("fade");
            }
            $node.html([
                '<div class="modal-dialog">',
                '  <div class="modal-content">',
                (options.title
                    ? '    <div class="modal-header">' +
                    '      <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>' +
                    '      <h4 class="modal-title">' +
                    options.title +
                    "</h4>" +
                    "    </div>"
                    : ""
                ),
                '    <div class="modal-body">' + options.body + "</div>",
                (options.footer ? '    <div class="modal-footer">' + options.footer + "</div>" : ""
                ),
                "  </div>",
                "</div>"
            ].join(""));
        });

    var popover = renderer.create([
            '<div class="note-popover popover in">',
            '  <div class="arrow"/>',
            '  <div class="popover-content note-children-container"/>',
            "</div>"
        ].join(""),
        function($node, options) {
            var direction = typeof options.direction !== "undefined" ? options.direction : "bottom";

            $node.addClass(direction);

            if (options.hideArrow) {
                $node.find(".arrow").hide();
            }
        });

    var icon = function(iconClassName, tagName) {
        tagName = tagName || "i";
        return "<" + tagName + ' class="' + iconClassName + '"/>';
    };

    var ui = {
        editor: editor,
        toolbar: toolbar,
        editingArea: editingArea,
        codable: codable,
        editable: editable,
        statusbar: statusbar,
        airEditor: airEditor,
        airEditable: airEditable,
        buttonGroup: buttonGroup,
        button: button,
        dropdown: dropdown,
        dropdownCheck: dropdownCheck,
        palette: palette,
        dialog: dialog,
        popover: popover,
        icon: icon,

        toggleBtn: function($btn, isEnable) {
            $btn.toggleClass("disabled", !isEnable);
            $btn.attr("disabled", !isEnable);
        },

        toggleBtnActive: function($btn, isActive) {
            $btn.toggleClass("active", isActive);
        },

        onDialogShown: function($dialog, handler) {
            $dialog.one("shown.bs.modal", handler);
        },

        onDialogHidden: function($dialog, handler) {
            $dialog.one("hidden.bs.modal", handler);
        },

        showDialog: function($dialog) {
            $dialog.modal("show");
        },

        hideDialog: function($dialog) {
            $dialog.modal("hide");
        },

        createLayout: function($note, options) {
            var $editor = (options.airMode
                ? ui.airEditor([
                    ui.editingArea([
                        ui.airEditable()
                    ])
                ])
                : ui.editor([
                    ui.toolbar(),
                    ui.editingArea([
                        ui.codable(),
                        ui.editable()
                    ]),
                    ui.statusbar()
                ])).render();

            $editor.insertAfter($note);

            return {
                note: $note,
                editor: $editor,
                toolbar: $editor.find(".note-toolbar"),
                editingArea: $editor.find(".note-editing-area"),
                editable: $editor.find(".note-editable"),
                codable: $editor.find(".note-codable"),
                statusbar: $editor.find(".note-statusbar")
            };
        },

        removeLayout: function($note, layoutInfo) {
            $note.html(layoutInfo.editable.html());
            layoutInfo.editor.remove();
            $note.show();
        }
    };

    $.summernote = $.summernote ||
    {
        lang: {}
    };

    $.extend($.summernote.lang,
        {
            'en-US': {
                font: {
                    bold: "Bold",
                    italic: "Italic",
                    underline: "Underline",
                    clear: "Remove Font Style",
                    height: "Line Height",
                    name: "Font Family",
                    strikethrough: "Strikethrough",
                    subscript: "Subscript",
                    superscript: "Superscript",
                    size: "Font Size"
                },
                image: {
                    image: "Picture",
                    insert: "Insert Image",
                    resizeFull: "Resize Full",
                    resizeHalf: "Resize Half",
                    resizeQuarter: "Resize Quarter",
                    floatLeft: "Float Left",
                    floatRight: "Float Right",
                    floatNone: "Float None",
                    shapeRounded: "Shape: Rounded",
                    shapeCircle: "Shape: Circle",
                    shapeThumbnail: "Shape: Thumbnail",
                    shapeNone: "Shape: None",
                    dragImageHere: "Drag image or text here",
                    dropImage: "Drop image or Text",
                    selectFromFiles: "Select from files",
                    maximumFileSize: "Maximum file size",
                    maximumFileSizeError: "Maximum file size exceeded.",
                    url: "Image URL",
                    remove: "Remove Image"
                },
                video: {
                    video: "Video",
                    videoLink: "Video Link",
                    insert: "Insert Video",
                    url: "Video URL?",
                    providers: "(YouTube, Vimeo, Vine, Instagram, DailyMotion or Youku)"
                },
                link: {
                    link: "Link",
                    insert: "Insert Link",
                    unlink: "Unlink",
                    edit: "Edit",
                    textToDisplay: "Text to display",
                    url: "To what URL should this link go?",
                    openInNewWindow: "Open in new window"
                },
                table: {
                    table: "Table"
                },
                hr: {
                    insert: "Insert Horizontal Rule"
                },
                style: {
                    style: "Style",
                    normal: "Normal",
                    blockquote: "Quote",
                    pre: "Code",
                    h1: "Header 1",
                    h2: "Header 2",
                    h3: "Header 3",
                    h4: "Header 4",
                    h5: "Header 5",
                    h6: "Header 6"
                },
                lists: {
                    unordered: "Unordered list",
                    ordered: "Ordered list"
                },
                options: {
                    help: "Help",
                    fullscreen: "Full Screen",
                    codeview: "Code View"
                },
                paragraph: {
                    paragraph: "Paragraph",
                    outdent: "Outdent",
                    indent: "Indent",
                    left: "Align left",
                    center: "Align center",
                    right: "Align right",
                    justify: "Justify full"
                },
                color: {
                    recent: "Recent Color",
                    more: "More Color",
                    background: "Background Color",
                    foreground: "Foreground Color",
                    transparent: "Transparent",
                    setTransparent: "Set transparent",
                    reset: "Reset",
                    resetToDefault: "Reset to default"
                },
                shortcut: {
                    shortcuts: "Keyboard shortcuts",
                    close: "Close",
                    textFormatting: "Text formatting",
                    action: "Action",
                    paragraphFormatting: "Paragraph formatting",
                    documentStyle: "Document Style",
                    extraKeys: "Extra keys"
                },
                help: {
                    'insertParagraph': "Insert Paragraph",
                    'undo': "Undoes the last command",
                    'redo': "Redoes the last command",
                    'tab': "Tab",
                    'untab': "Untab",
                    'bold': "Set a bold style",
                    'italic': "Set a italic style",
                    'underline': "Set a underline style",
                    'strikethrough': "Set a strikethrough style",
                    'removeFormat': "Clean a style",
                    'justifyLeft': "Set left align",
                    'justifyCenter': "Set center align",
                    'justifyRight': "Set right align",
                    'justifyFull': "Set full align",
                    'insertUnorderedList': "Toggle unordered list",
                    'insertOrderedList': "Toggle ordered list",
                    'outdent': "Outdent on current paragraph",
                    'indent': "Indent on current paragraph",
                    'formatPara': "Change current block's format as a paragraph(P tag)",
                    'formatH1': "Change current block's format as H1",
                    'formatH2': "Change current block's format as H2",
                    'formatH3': "Change current block's format as H3",
                    'formatH4': "Change current block's format as H4",
                    'formatH5': "Change current block's format as H5",
                    'formatH6': "Change current block's format as H6",
                    'insertHorizontalRule': "Insert horizontal rule",
                    'linkDialog.show': "Show Link Dialog"
                },
                history: {
                    undo: "Undo",
                    redo: "Redo"
                },
                specialChar: {
                    specialChar: "SPECIAL CHARACTERS",
                    select: "Select Special characters"
                }
            }
        });


    /**
     * @class core.key
     *
     * Object for keycodes.
     *
     * @singleton
     * @alternateClassName key
     */
    var key = (function() {
        var keyMap = {
            'BACKSPACE': 8,
            'TAB': 9,
            'ENTER': 13,
            'SPACE': 32,

            // Arrow
            'LEFT': 37,
            'UP': 38,
            'RIGHT': 39,
            'DOWN': 40,

            // Number: 0-9
            'NUM0': 48,
            'NUM1': 49,
            'NUM2': 50,
            'NUM3': 51,
            'NUM4': 52,
            'NUM5': 53,
            'NUM6': 54,
            'NUM7': 55,
            'NUM8': 56,

            // Alphabet: a-z
            'B': 66,
            'E': 69,
            'I': 73,
            'J': 74,
            'K': 75,
            'L': 76,
            'R': 82,
            'S': 83,
            'U': 85,
            'V': 86,
            'Y': 89,
            'Z': 90,

            'SLASH': 191,
            'LEFTBRACKET': 219,
            'BACKSLASH': 220,
            'RIGHTBRACKET': 221
        };

        return {
            /**
             * @method isEdit
             *
             * @param {Number} keyCode
             * @return {Boolean}
             */
            isEdit: function(keyCode) {
                return list.contains([
                        keyMap.BACKSPACE,
                        keyMap.TAB,
                        keyMap.ENTER,
                        keyMap.SPACE
                    ],
                    keyCode);
            },
            /**
             * @method isMove
             *
             * @param {Number} keyCode
             * @return {Boolean}
             */
            isMove: function(keyCode) {
                return list.contains([
                        keyMap.LEFT,
                        keyMap.UP,
                        keyMap.RIGHT,
                        keyMap.DOWN
                    ],
                    keyCode);
            },
            /**
             * @property {Object} nameFromCode
             * @property {String} nameFromCode.8 "BACKSPACE"
             */
            nameFromCode: func.invertObject(keyMap),
            code: keyMap
        };
    })();

    var range = (function() {

        /**
         * return boundaryPoint from TextRange, inspired by Andy Na's HuskyRange.js
         *
         * @param {TextRange} textRange
         * @param {Boolean} isStart
         * @return {BoundaryPoint}
         *
         * @see http://msdn.microsoft.com/en-us/library/ie/ms535872(v=vs.85).aspx
         */
        var textRangeToPoint = function(textRange, isStart) {
            var container = textRange.parentElement(), offset;

            var tester = document.body.createTextRange(), prevContainer;
            var childNodes = list.from(container.childNodes);
            for (offset = 0; offset < childNodes.length; offset++) {
                if (dom.isText(childNodes[offset])) {
                    continue;
                }
                tester.moveToElementText(childNodes[offset]);
                if (tester.compareEndPoints("StartToStart", textRange) >= 0) {
                    break;
                }
                prevContainer = childNodes[offset];
            }

            if (offset !== 0 && dom.isText(childNodes[offset - 1])) {
                var textRangeStart = document.body.createTextRange(), curTextNode = null;
                textRangeStart.moveToElementText(prevContainer || container);
                textRangeStart.collapse(!prevContainer);
                curTextNode = prevContainer ? prevContainer.nextSibling : container.firstChild;

                var pointTester = textRange.duplicate();
                pointTester.setEndPoint("StartToStart", textRangeStart);
                var textCount = pointTester.text.replace(/[\r\n]/g, "").length;

                while (textCount > curTextNode.nodeValue.length && curTextNode.nextSibling) {
                    textCount -= curTextNode.nodeValue.length;
                    curTextNode = curTextNode.nextSibling;
                }

                /* jshint ignore:start */
                var dummy = curTextNode.nodeValue; // enforce IE to re-reference curTextNode, hack
                /* jshint ignore:end */

                if (isStart &&
                    curTextNode.nextSibling &&
                    dom.isText(curTextNode.nextSibling) &&
                    textCount === curTextNode.nodeValue.length) {
                    textCount -= curTextNode.nodeValue.length;
                    curTextNode = curTextNode.nextSibling;
                }

                container = curTextNode;
                offset = textCount;
            }

            return {
                cont: container,
                offset: offset
            };
        };

        /**
         * return TextRange from boundary point (inspired by google closure-library)
         * @param {BoundaryPoint} point
         * @return {TextRange}
         */
        var pointToTextRange = function(point) {
            var textRangeInfo = function(container, offset) {
                var node, isCollapseToStart;

                if (dom.isText(container)) {
                    var prevTextNodes = dom.listPrev(container, func.not(dom.isText));
                    var prevContainer = list.last(prevTextNodes).previousSibling;
                    node = prevContainer || container.parentNode;
                    offset += list.sum(list.tail(prevTextNodes), dom.nodeLength);
                    isCollapseToStart = !prevContainer;
                } else {
                    node = container.childNodes[offset] || container;
                    if (dom.isText(node)) {
                        return textRangeInfo(node, 0);
                    }

                    offset = 0;
                    isCollapseToStart = false;
                }

                return {
                    node: node,
                    collapseToStart: isCollapseToStart,
                    offset: offset
                };
            };

            var textRange = document.body.createTextRange();
            var info = textRangeInfo(point.node, point.offset);

            textRange.moveToElementText(info.node);
            textRange.collapse(info.collapseToStart);
            textRange.moveStart("character", info.offset);
            return textRange;
        };

        /**
         * Wrapped Range
         *
         * @constructor
         * @param {Node} sc - start container
         * @param {Number} so - start offset
         * @param {Node} ec - end container
         * @param {Number} eo - end offset
         */
        var WrappedRange = function(sc, so, ec, eo) {
            this.sc = sc;
            this.so = so;
            this.ec = ec;
            this.eo = eo;

            // nativeRange: get nativeRange from sc, so, ec, eo
            var nativeRange = function() {
                if (agent.isW3CRangeSupport) {
                    var w3cRange = document.createRange();
                    w3cRange.setStart(sc, so);
                    w3cRange.setEnd(ec, eo);

                    return w3cRange;
                } else {
                    var textRange = pointToTextRange({
                        node: sc,
                        offset: so
                    });

                    textRange.setEndPoint("EndToEnd",
                        pointToTextRange({
                            node: ec,
                            offset: eo
                        }));

                    return textRange;
                }
            };

            this.getPoints = function() {
                return {
                    sc: sc,
                    so: so,
                    ec: ec,
                    eo: eo
                };
            };

            this.getStartPoint = function() {
                return {
                    node: sc,
                    offset: so
                };
            };

            this.getEndPoint = function() {
                return {
                    node: ec,
                    offset: eo
                };
            };

            /**
             * select update visible range
             */
            this.select = function() {
                var nativeRng = nativeRange();
                if (agent.isW3CRangeSupport) {
                    var selection = document.getSelection();
                    if (selection.rangeCount > 0) {
                        selection.removeAllRanges();
                    }
                    selection.addRange(nativeRng);
                } else {
                    nativeRng.select();
                }

                return this;
            };

            /**
             * Moves the scrollbar to start container(sc) of current range
             *
             * @return {WrappedRange}
             */
            this.scrollIntoView = function(container) {
                var height = $(container).height();
                if (container.scrollTop + height < this.sc.offsetTop) {
                    container.scrollTop += Math.abs(container.scrollTop + height - this.sc.offsetTop);
                }

                return this;
            };

            /**
             * @return {WrappedRange}
             */
            this.normalize = function() {

                /**
                 * @param {BoundaryPoint} point
                 * @param {Boolean} isLeftToRight
                 * @return {BoundaryPoint}
                 */
                var getVisiblePoint = function(point, isLeftToRight) {
                    if ((dom.isVisiblePoint(point) && !dom.isEdgePoint(point)) ||
                        (dom.isVisiblePoint(point) && dom.isRightEdgePoint(point) && !isLeftToRight) ||
                        (dom.isVisiblePoint(point) && dom.isLeftEdgePoint(point) && isLeftToRight) ||
                        (dom.isVisiblePoint(point) && dom.isBlock(point.node) && dom.isEmpty(point.node))) {
                        return point;
                    }

                    // point on block's edge
                    var block = dom.ancestor(point.node, dom.isBlock);
                    if (((dom.isLeftEdgePointOf(point, block) || dom.isVoid(dom.prevPoint(point).node)) &&
                            !isLeftToRight) ||
                        ((dom.isRightEdgePointOf(point, block) || dom.isVoid(dom.nextPoint(point).node)) &&
                            isLeftToRight)) {

                        // returns point already on visible point
                        if (dom.isVisiblePoint(point)) {
                            return point;
                        }
                        // reverse direction 
                        isLeftToRight = !isLeftToRight;
                    }

                    var nextPoint = isLeftToRight
                        ? dom.nextPointUntil(dom.nextPoint(point), dom.isVisiblePoint)
                        : dom.prevPointUntil(dom.prevPoint(point), dom.isVisiblePoint);
                    return nextPoint || point;
                };

                var endPoint = getVisiblePoint(this.getEndPoint(), false);
                var startPoint = this.isCollapsed() ? endPoint : getVisiblePoint(this.getStartPoint(), true);

                return new WrappedRange(
                    startPoint.node,
                    startPoint.offset,
                    endPoint.node,
                    endPoint.offset
                );
            };

            /**
             * returns matched nodes on range
             *
             * @param {Function} [pred] - predicate function
             * @param {Object} [options]
             * @param {Boolean} [options.includeAncestor]
             * @param {Boolean} [options.fullyContains]
             * @return {Node[]}
             */
            this.nodes = function(pred, options) {
                pred = pred || func.ok;

                var includeAncestor = options && options.includeAncestor;
                var fullyContains = options && options.fullyContains;

                // TODO compare points and sort
                var startPoint = this.getStartPoint();
                var endPoint = this.getEndPoint();

                var nodes = [];
                var leftEdgeNodes = [];

                dom.walkPoint(startPoint,
                    endPoint,
                    function(point) {
                        if (dom.isEditable(point.node)) {
                            return;
                        }

                        var node;
                        if (fullyContains) {
                            if (dom.isLeftEdgePoint(point)) {
                                leftEdgeNodes.push(point.node);
                            }
                            if (dom.isRightEdgePoint(point) && list.contains(leftEdgeNodes, point.node)) {
                                node = point.node;
                            }
                        } else if (includeAncestor) {
                            node = dom.ancestor(point.node, pred);
                        } else {
                            node = point.node;
                        }

                        if (node && pred(node)) {
                            nodes.push(node);
                        }
                    },
                    true);

                return list.unique(nodes);
            };

            /**
             * returns commonAncestor of range
             * @return {Element} - commonAncestor
             */
            this.commonAncestor = function() {
                return dom.commonAncestor(sc, ec);
            };

            /**
             * returns expanded range by pred
             *
             * @param {Function} pred - predicate function
             * @return {WrappedRange}
             */
            this.expand = function(pred) {
                var startAncestor = dom.ancestor(sc, pred);
                var endAncestor = dom.ancestor(ec, pred);

                if (!startAncestor && !endAncestor) {
                    return new WrappedRange(sc, so, ec, eo);
                }

                var boundaryPoints = this.getPoints();

                if (startAncestor) {
                    boundaryPoints.sc = startAncestor;
                    boundaryPoints.so = 0;
                }

                if (endAncestor) {
                    boundaryPoints.ec = endAncestor;
                    boundaryPoints.eo = dom.nodeLength(endAncestor);
                }

                return new WrappedRange(
                    boundaryPoints.sc,
                    boundaryPoints.so,
                    boundaryPoints.ec,
                    boundaryPoints.eo
                );
            };

            /**
             * @param {Boolean} isCollapseToStart
             * @return {WrappedRange}
             */
            this.collapse = function(isCollapseToStart) {
                if (isCollapseToStart) {
                    return new WrappedRange(sc, so, sc, so);
                } else {
                    return new WrappedRange(ec, eo, ec, eo);
                }
            };

            /**
             * splitText on range
             */
            this.splitText = function() {
                var isSameContainer = sc === ec;
                var boundaryPoints = this.getPoints();

                if (dom.isText(ec) && !dom.isEdgePoint(this.getEndPoint())) {
                    ec.splitText(eo);
                }

                if (dom.isText(sc) && !dom.isEdgePoint(this.getStartPoint())) {
                    boundaryPoints.sc = sc.splitText(so);
                    boundaryPoints.so = 0;

                    if (isSameContainer) {
                        boundaryPoints.ec = boundaryPoints.sc;
                        boundaryPoints.eo = eo - so;
                    }
                }

                return new WrappedRange(
                    boundaryPoints.sc,
                    boundaryPoints.so,
                    boundaryPoints.ec,
                    boundaryPoints.eo
                );
            };

            /**
             * delete contents on range
             * @return {WrappedRange}
             */
            this.deleteContents = function() {
                if (this.isCollapsed()) {
                    return this;
                }

                var rng = this.splitText();
                var nodes = rng.nodes(null,
                    {
                        fullyContains: true
                    });

                // find new cursor point
                var point = dom.prevPointUntil(rng.getStartPoint(),
                    function(point) {
                        return !list.contains(nodes, point.node);
                    });

                var emptyParents = [];
                $.each(nodes,
                    function(idx, node) {
                        // find empty parents
                        var parent = node.parentNode;
                        if (point.node !== parent && dom.nodeLength(parent) === 1) {
                            emptyParents.push(parent);
                        }
                        dom.remove(node, false);
                    });

                // remove empty parents
                $.each(emptyParents,
                    function(idx, node) {
                        dom.remove(node, false);
                    });

                return new WrappedRange(
                    point.node,
                    point.offset,
                    point.node,
                    point.offset
                ).normalize();
            };

            /**
             * makeIsOn: return isOn(pred) function
             */
            var makeIsOn = function(pred) {
                return function() {
                    var ancestor = dom.ancestor(sc, pred);
                    return !!ancestor && (ancestor === dom.ancestor(ec, pred));
                };
            };

            // isOnEditable: judge whether range is on editable or not
            this.isOnEditable = makeIsOn(dom.isEditable);
            // isOnList: judge whether range is on list node or not
            this.isOnList = makeIsOn(dom.isList);
            // isOnAnchor: judge whether range is on anchor node or not
            this.isOnAnchor = makeIsOn(dom.isAnchor);
            // isOnAnchor: judge whether range is on cell node or not
            this.isOnCell = makeIsOn(dom.isCell);

            /**
             * @param {Function} pred
             * @return {Boolean}
             */
            this.isLeftEdgeOf = function(pred) {
                if (!dom.isLeftEdgePoint(this.getStartPoint())) {
                    return false;
                }

                var node = dom.ancestor(this.sc, pred);
                return node && dom.isLeftEdgeOf(this.sc, node);
            };

            /**
             * returns whether range was collapsed or not
             */
            this.isCollapsed = function() {
                return sc === ec && so === eo;
            };

            /**
             * wrap inline nodes which children of body with paragraph
             *
             * @return {WrappedRange}
             */
            this.wrapBodyInlineWithPara = function() {
                if (dom.isBodyContainer(sc) && dom.isEmpty(sc)) {
                    sc.innerHTML = dom.emptyPara;
                    return new WrappedRange(sc.firstChild, 0, sc.firstChild, 0);
                }

                /**
                 * [workaround] firefox often create range on not visible point. so normalize here.
                 *  - firefox: |<p>text</p>|
                 *  - chrome: <p>|text|</p>
                 */
                var rng = this.normalize();
                if (dom.isParaInline(sc) || dom.isPara(sc)) {
                    return rng;
                }

                // find inline top ancestor
                var topAncestor;
                if (dom.isInline(rng.sc)) {
                    var ancestors = dom.listAncestor(rng.sc, func.not(dom.isInline));
                    topAncestor = list.last(ancestors);
                    if (!dom.isInline(topAncestor)) {
                        topAncestor = ancestors[ancestors.length - 2] || rng.sc.childNodes[rng.so];
                    }
                } else {
                    topAncestor = rng.sc.childNodes[rng.so > 0 ? rng.so - 1 : 0];
                }

                // siblings not in paragraph
                var inlineSiblings = dom.listPrev(topAncestor, dom.isParaInline).reverse();
                inlineSiblings = inlineSiblings.concat(dom.listNext(topAncestor.nextSibling, dom.isParaInline));

                // wrap with paragraph
                if (inlineSiblings.length) {
                    var para = dom.wrap(list.head(inlineSiblings), "p");
                    dom.appendChildNodes(para, list.tail(inlineSiblings));
                }

                return this.normalize();
            };

            /**
             * insert node at current cursor
             *
             * @param {Node} node
             * @return {Node}
             */
            this.insertNode = function(node) {
                var rng = this.wrapBodyInlineWithPara().deleteContents();
                var info = dom.splitPoint(rng.getStartPoint(), dom.isInline(node));

                if (info.rightNode) {
                    info.rightNode.parentNode.insertBefore(node, info.rightNode);
                } else {
                    info.container.appendChild(node);
                }

                return node;
            };

            /**
             * insert html at current cursor
             */
            this.pasteHTML = function(markup) {
                var contentsContainer = $("<div></div>").html(markup)[0];
                var childNodes = list.from(contentsContainer.childNodes);

                var rng = this.wrapBodyInlineWithPara().deleteContents();

                return childNodes.reverse().map(function(childNode) {
                    return rng.insertNode(childNode);
                }).reverse();
            };

            /**
             * returns text in range
             *
             * @return {String}
             */
            this.toString = function() {
                var nativeRng = nativeRange();
                return agent.isW3CRangeSupport ? nativeRng.toString() : nativeRng.text;
            };

            /**
             * returns range for word before cursor
             *
             * @param {Boolean} [findAfter] - find after cursor, default: false
             * @return {WrappedRange}
             */
            this.getWordRange = function(findAfter) {
                var endPoint = this.getEndPoint();

                if (!dom.isCharPoint(endPoint)) {
                    return this;
                }

                var startPoint = dom.prevPointUntil(endPoint,
                    function(point) {
                        return !dom.isCharPoint(point);
                    });

                if (findAfter) {
                    endPoint = dom.nextPointUntil(endPoint,
                        function(point) {
                            return !dom.isCharPoint(point);
                        });
                }

                return new WrappedRange(
                    startPoint.node,
                    startPoint.offset,
                    endPoint.node,
                    endPoint.offset
                );
            };

            /**
             * create offsetPath bookmark
             *
             * @param {Node} editable
             */
            this.bookmark = function(editable) {
                return {
                    s: {
                        path: dom.makeOffsetPath(editable, sc),
                        offset: so
                    },
                    e: {
                        path: dom.makeOffsetPath(editable, ec),
                        offset: eo
                    }
                };
            };

            /**
             * create offsetPath bookmark base on paragraph
             *
             * @param {Node[]} paras
             */
            this.paraBookmark = function(paras) {
                return {
                    s: {
                        path: list.tail(dom.makeOffsetPath(list.head(paras), sc)),
                        offset: so
                    },
                    e: {
                        path: list.tail(dom.makeOffsetPath(list.last(paras), ec)),
                        offset: eo
                    }
                };
            };

            /**
             * getClientRects
             * @return {Rect[]}
             */
            this.getClientRects = function() {
                var nativeRng = nativeRange();
                return nativeRng.getClientRects();
            };
        };

        /**
         * @class core.range
         *
         * Data structure
         *  * BoundaryPoint: a point of dom tree
         *  * BoundaryPoints: two boundaryPoints corresponding to the start and the end of the Range
         *
         * See to http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level-2-Range-Position
         *
         * @singleton
         * @alternateClassName range
         */
        return {
            /**
             * create Range Object From arguments or Browser Selection
             *
             * @param {Node} sc - start container
             * @param {Number} so - start offset
             * @param {Node} ec - end container
             * @param {Number} eo - end offset
             * @return {WrappedRange}
             */
            create: function(sc, so, ec, eo) {
                if (arguments.length === 4) {
                    return new WrappedRange(sc, so, ec, eo);
                } else if (arguments.length === 2) { //collapsed
                    ec = sc;
                    eo = so;
                    return new WrappedRange(sc, so, ec, eo);
                } else {
                    var wrappedRange = this.createFromSelection();
                    if (!wrappedRange && arguments.length === 1) {
                        wrappedRange = this.createFromNode(arguments[0]);
                        return wrappedRange.collapse(dom.emptyPara === arguments[0].innerHTML);
                    }
                    return wrappedRange;
                }
            },

            createFromSelection: function() {
                var sc, so, ec, eo;
                if (agent.isW3CRangeSupport) {
                    var selection = document.getSelection();
                    if (!selection || selection.rangeCount === 0) {
                        return null;
                    } else if (dom.isBody(selection.anchorNode)) {
                        // Firefox: returns entire body as range on initialization.
                        // We won't never need it.
                        return null;
                    }

                    var nativeRng = selection.getRangeAt(0);
                    sc = nativeRng.startContainer;
                    so = nativeRng.startOffset;
                    ec = nativeRng.endContainer;
                    eo = nativeRng.endOffset;
                } else { // IE8: TextRange
                    var textRange = document.selection.createRange();
                    var textRangeEnd = textRange.duplicate();
                    textRangeEnd.collapse(false);
                    var textRangeStart = textRange;
                    textRangeStart.collapse(true);

                    var startPoint = textRangeToPoint(textRangeStart, true),
                        endPoint = textRangeToPoint(textRangeEnd, false);

                    // same visible point case: range was collapsed.
                    if (dom.isText(startPoint.node) &&
                        dom.isLeftEdgePoint(startPoint) &&
                        dom.isTextNode(endPoint.node) &&
                        dom.isRightEdgePoint(endPoint) &&
                        endPoint.node.nextSibling === startPoint.node) {
                        startPoint = endPoint;
                    }

                    sc = startPoint.cont;
                    so = startPoint.offset;
                    ec = endPoint.cont;
                    eo = endPoint.offset;
                }

                return new WrappedRange(sc, so, ec, eo);
            },

            /**
             * @method 
             * 
             * create WrappedRange from node
             *
             * @param {Node} node
             * @return {WrappedRange}
             */
            createFromNode: function(node) {
                var sc = node;
                var so = 0;
                var ec = node;
                var eo = dom.nodeLength(ec);

                // browsers can't target a picture or void node
                if (dom.isVoid(sc)) {
                    so = dom.listPrev(sc).length - 1;
                    sc = sc.parentNode;
                }
                if (dom.isBR(ec)) {
                    eo = dom.listPrev(ec).length - 1;
                    ec = ec.parentNode;
                } else if (dom.isVoid(ec)) {
                    eo = dom.listPrev(ec).length;
                    ec = ec.parentNode;
                }

                return this.create(sc, so, ec, eo);
            },

            /**
             * create WrappedRange from node after position
             *
             * @param {Node} node
             * @return {WrappedRange}
             */
            createFromNodeBefore: function(node) {
                return this.createFromNode(node).collapse(true);
            },

            /**
             * create WrappedRange from node after position
             *
             * @param {Node} node
             * @return {WrappedRange}
             */
            createFromNodeAfter: function(node) {
                return this.createFromNode(node).collapse();
            },

            /**
             * @method 
             * 
             * create WrappedRange from bookmark
             *
             * @param {Node} editable
             * @param {Object} bookmark
             * @return {WrappedRange}
             */
            createFromBookmark: function(editable, bookmark) {
                var sc = dom.fromOffsetPath(editable, bookmark.s.path);
                var so = bookmark.s.offset;
                var ec = dom.fromOffsetPath(editable, bookmark.e.path);
                var eo = bookmark.e.offset;
                return new WrappedRange(sc, so, ec, eo);
            },

            /**
             * @method 
             *
             * create WrappedRange from paraBookmark
             *
             * @param {Object} bookmark
             * @param {Node[]} paras
             * @return {WrappedRange}
             */
            createFromParaBookmark: function(bookmark, paras) {
                var so = bookmark.s.offset;
                var eo = bookmark.e.offset;
                var sc = dom.fromOffsetPath(list.head(paras), bookmark.s.path);
                var ec = dom.fromOffsetPath(list.last(paras), bookmark.e.path);

                return new WrappedRange(sc, so, ec, eo);
            }
        };
    })();

    /**
     * @class core.async
     *
     * Async functions which returns `Promise`
     *
     * @singleton
     * @alternateClassName async
     */
    var async = (function() {
        /**
         * @method readFileAsDataURL
         *
         * read contents of file as representing URL
         *
         * @param {File} file
         * @return {Promise} - then: dataUrl
         */
        var readFileAsDataURL = function(file) {
            return $.Deferred(function(deferred) {
                $.extend(new FileReader(),
                    {
                        onload: function(e) {
                            var dataURL = e.target.result;
                            deferred.resolve(dataURL);
                        },
                        onerror: function() {
                            deferred.reject(this);
                        }
                    }).readAsDataURL(file);
            }).promise();
        };

        /**
         * @method createImage
         *
         * create `<image>` from url string
         *
         * @param {String} url
         * @return {Promise} - then: $image
         */
        var createImage = function(url) {
            return $.Deferred(function(deferred) {
                var $img = $("<img>");

                $img.one("load",
                    function() {
                        $img.off("error abort");
                        deferred.resolve($img);
                    }).one("error abort",
                    function() {
                        $img.off("load").detach();
                        deferred.reject($img);
                    }).css({
                    display: "none"
                }).appendTo(document.body).attr("src", url);
            }).promise();
        };

        return {
            readFileAsDataURL: readFileAsDataURL,
            createImage: createImage
        };
    })();

    /**
     * @class editing.History
     *
     * Editor History
     *
     */
    var History = function($editable) {
        var stack = [], stackOffset = -1;
        var editable = $editable[0];

        var makeSnapshot = function() {
            var rng = range.create(editable);
            var emptyBookmark = { s: { path: [], offset: 0 }, e: { path: [], offset: 0 } };

            return {
                contents: $editable.html(),
                bookmark: (rng ? rng.bookmark(editable) : emptyBookmark)
            };
        };

        var applySnapshot = function(snapshot) {
            if (snapshot.contents !== null) {
                $editable.html(snapshot.contents);
            }
            if (snapshot.bookmark !== null) {
                range.createFromBookmark(editable, snapshot.bookmark).select();
            }
        };

        /**
        * @method rewind
        * Rewinds the history stack back to the first snapshot taken.
        * Leaves the stack intact, so that "Redo" can still be used.
        */
        this.rewind = function() {
            // Create snap shot if not yet recorded
            if ($editable.html() !== stack[stackOffset].contents) {
                this.recordUndo();
            }

            // Return to the first available snapshot.
            stackOffset = 0;

            // Apply that snapshot.
            applySnapshot(stack[stackOffset]);
        };

        /**
        * @method reset
        * Resets the history stack completely; reverting to an empty editor.
        */
        this.reset = function() {
            // Clear the stack.
            stack = [];

            // Restore stackOffset to its original value.
            stackOffset = -1;

            // Clear the editable area.
            $editable.html("");

            // Record our first snapshot (of nothing).
            this.recordUndo();
        };

        /**
         * undo
         */
        this.undo = function() {
            // Create snap shot if not yet recorded
            if ($editable.html() !== stack[stackOffset].contents) {
                this.recordUndo();
            }

            if (0 < stackOffset) {
                stackOffset--;
                applySnapshot(stack[stackOffset]);
            }
        };

        /**
         * redo
         */
        this.redo = function() {
            if (stack.length - 1 > stackOffset) {
                stackOffset++;
                applySnapshot(stack[stackOffset]);
            }
        };

        /**
         * recorded undo
         */
        this.recordUndo = function() {
            stackOffset++;

            // Wash out stack after stackOffset
            if (stack.length > stackOffset) {
                stack = stack.slice(0, stackOffset);
            }

            // Create new snapshot and push it to the end
            stack.push(makeSnapshot());
        };
    };

    /**
     * @class editing.Style
     *
     * Style
     *
     */
    var Style = function() {
        /**
         * @method jQueryCSS
         *
         * [workaround] for old jQuery
         * passing an array of style properties to .css()
         * will result in an object of property-value pairs.
         * (compability with version < 1.9)
         *
         * @private
         * @param  {jQuery} $obj
         * @param  {Array} propertyNames - An array of one or more CSS properties.
         * @return {Object}
         */
        var jQueryCSS = function($obj, propertyNames) {
            if (agent.jqueryVersion < 1.9) {
                var result = {};
                $.each(propertyNames,
                    function(idx, propertyName) {
                        result[propertyName] = $obj.css(propertyName);
                    });
                return result;
            }
            return $obj.css.call($obj, propertyNames);
        };

        /**
         * returns style object from node
         *
         * @param {jQuery} $node
         * @return {Object}
         */
        this.fromNode = function($node) {
            var properties = ["font-family", "font-size", "text-align", "list-style-type", "line-height"];
            var styleInfo = jQueryCSS($node, properties) || {};
            styleInfo["font-size"] = parseInt(styleInfo["font-size"], 10);
            return styleInfo;
        };

        /**
         * paragraph level style
         *
         * @param {WrappedRange} rng
         * @param {Object} styleInfo
         */
        this.stylePara = function(rng, styleInfo) {
            $.each(rng.nodes(dom.isPara,
                    {
                        includeAncestor: true
                    }),
                function(idx, para) {
                    $(para).css(styleInfo);
                });
        };

        /**
         * insert and returns styleNodes on range.
         *
         * @param {WrappedRange} rng
         * @param {Object} [options] - options for styleNodes
         * @param {String} [options.nodeName] - default: `SPAN`
         * @param {Boolean} [options.expandClosestSibling] - default: `false`
         * @param {Boolean} [options.onlyPartialContains] - default: `false`
         * @return {Node[]}
         */
        this.styleNodes = function(rng, options) {
            rng = rng.splitText();

            var nodeName = options && options.nodeName || "SPAN";
            var expandClosestSibling = !!(options && options.expandClosestSibling);
            var onlyPartialContains = !!(options && options.onlyPartialContains);

            if (rng.isCollapsed()) {
                return [rng.insertNode(dom.create(nodeName))];
            }

            var pred = dom.makePredByNodeName(nodeName);
            var nodes = rng.nodes(dom.isText,
                {
                    fullyContains: true
                }).map(function(text) {
                return dom.singleChildAncestor(text, pred) || dom.wrap(text, nodeName);
            });

            if (expandClosestSibling) {
                if (onlyPartialContains) {
                    var nodesInRange = rng.nodes();
                    // compose with partial contains predication
                    pred = func.and(pred,
                        function(node) {
                            return list.contains(nodesInRange, node);
                        });
                }

                return nodes.map(function(node) {
                    var siblings = dom.withClosestSiblings(node, pred);
                    var head = list.head(siblings);
                    var tails = list.tail(siblings);
                    $.each(tails,
                        function(idx, elem) {
                            dom.appendChildNodes(head, elem.childNodes);
                            dom.remove(elem);
                        });
                    return list.head(siblings);
                });
            } else {
                return nodes;
            }
        };

        /**
         * get current style on cursor
         *
         * @param {WrappedRange} rng
         * @return {Object} - object contains style properties.
         */
        this.current = function(rng) {
            var $cont = $(!dom.isElement(rng.sc) ? rng.sc.parentNode : rng.sc);
            var styleInfo = this.fromNode($cont);

            // document.queryCommandState for toggle state
            // [workaround] prevent Firefox nsresult: "0x80004005 (NS_ERROR_FAILURE)"
            try {
                styleInfo = $.extend(styleInfo,
                    {
                        'font-bold': document.queryCommandState("bold") ? "bold" : "normal",
                        'font-italic': document.queryCommandState("italic") ? "italic" : "normal",
                        'font-underline': document.queryCommandState("underline") ? "underline" : "normal",
                        'font-subscript': document.queryCommandState("subscript") ? "subscript" : "normal",
                        'font-superscript': document.queryCommandState("superscript") ? "superscript" : "normal",
                        'font-strikethrough': document.queryCommandState("strikethrough") ? "strikethrough" : "normal"
                    });
            } catch (e) {
            }

            // list-style-type to list-style(unordered, ordered)
            if (!rng.isOnList()) {
                styleInfo["list-style"] = "none";
            } else {
                var orderedTypes = ["circle", "disc", "disc-leading-zero", "square"];
                var isUnordered = $.inArray(styleInfo["list-style-type"], orderedTypes) > -1;
                styleInfo["list-style"] = isUnordered ? "unordered" : "ordered";
            }

            var para = dom.ancestor(rng.sc, dom.isPara);
            if (para && para.style["line-height"]) {
                styleInfo["line-height"] = para.style.lineHeight;
            } else {
                var lineHeight = parseInt(styleInfo["line-height"], 10) / parseInt(styleInfo["font-size"], 10);
                styleInfo["line-height"] = lineHeight.toFixed(1);
            }

            styleInfo.anchor = rng.isOnAnchor() && dom.ancestor(rng.sc, dom.isAnchor);
            styleInfo.ancestors = dom.listAncestor(rng.sc, dom.isEditable);
            styleInfo.range = rng;

            return styleInfo;
        };
    };


    /**
     * @class editing.Bullet
     *
     * @alternateClassName Bullet
     */
    var Bullet = function() {
        var self = this;

        /**
         * toggle ordered list
         */
        this.insertOrderedList = function(editable) {
            this.toggleList("OL", editable);
        };

        /**
         * toggle unordered list
         */
        this.insertUnorderedList = function(editable) {
            this.toggleList("UL", editable);
        };

        /**
         * indent
         */
        this.indent = function(editable) {
            var self = this;
            var rng = range.create(editable).wrapBodyInlineWithPara();

            var paras = rng.nodes(dom.isPara, { includeAncestor: true });
            var clustereds = list.clusterBy(paras, func.peq2("parentNode"));

            $.each(clustereds,
                function(idx, paras) {
                    var head = list.head(paras);
                    if (dom.isLi(head)) {
                        self.wrapList(paras, head.parentNode.nodeName);
                    } else {
                        $.each(paras,
                            function(idx, para) {
                                $(para).css("marginLeft",
                                    function(idx, val) {
                                        return (parseInt(val, 10) || 0) + 25;
                                    });
                            });
                    }
                });

            rng.select();
        };

        /**
         * outdent
         */
        this.outdent = function(editable) {
            var self = this;
            var rng = range.create(editable).wrapBodyInlineWithPara();

            var paras = rng.nodes(dom.isPara, { includeAncestor: true });
            var clustereds = list.clusterBy(paras, func.peq2("parentNode"));

            $.each(clustereds,
                function(idx, paras) {
                    var head = list.head(paras);
                    if (dom.isLi(head)) {
                        self.releaseList([paras]);
                    } else {
                        $.each(paras,
                            function(idx, para) {
                                $(para).css("marginLeft",
                                    function(idx, val) {
                                        val = (parseInt(val, 10) || 0);
                                        return val > 25 ? val - 25 : "";
                                    });
                            });
                    }
                });

            rng.select();
        };

        /**
         * toggle list
         *
         * @param {String} listName - OL or UL
         */
        this.toggleList = function(listName, editable) {
            var rng = range.create(editable).wrapBodyInlineWithPara();

            var paras = rng.nodes(dom.isPara, { includeAncestor: true });
            var bookmark = rng.paraBookmark(paras);
            var clustereds = list.clusterBy(paras, func.peq2("parentNode"));

            // paragraph to list
            if (list.find(paras, dom.isPurePara)) {
                var wrappedParas = [];
                $.each(clustereds,
                    function(idx, paras) {
                        wrappedParas = wrappedParas.concat(self.wrapList(paras, listName));
                    });
                paras = wrappedParas;
                // list to paragraph or change list style
            } else {
                var diffLists = rng.nodes(dom.isList,
                    {
                        includeAncestor: true
                    }).filter(function(listNode) {
                    return !$.nodeName(listNode, listName);
                });

                if (diffLists.length) {
                    $.each(diffLists,
                        function(idx, listNode) {
                            dom.replace(listNode, listName);
                        });
                } else {
                    paras = this.releaseList(clustereds, true);
                }
            }

            range.createFromParaBookmark(bookmark, paras).select();
        };

        /**
         * @param {Node[]} paras
         * @param {String} listName
         * @return {Node[]}
         */
        this.wrapList = function(paras, listName) {
            var head = list.head(paras);
            var last = list.last(paras);

            var prevList = dom.isList(head.previousSibling) && head.previousSibling;
            var nextList = dom.isList(last.nextSibling) && last.nextSibling;

            var listNode = prevList || dom.insertAfter(dom.create(listName || "UL"), last);

            // P to LI
            paras = paras.map(function(para) {
                return dom.isPurePara(para) ? dom.replace(para, "LI") : para;
            });

            // append to list(<ul>, <ol>)
            dom.appendChildNodes(listNode, paras);

            if (nextList) {
                dom.appendChildNodes(listNode, list.from(nextList.childNodes));
                dom.remove(nextList);
            }

            return paras;
        };

        /**
         * @method releaseList
         *
         * @param {Array[]} clustereds
         * @param {Boolean} isEscapseToBody
         * @return {Node[]}
         */
        this.releaseList = function(clustereds, isEscapseToBody) {
            var releasedParas = [];

            $.each(clustereds,
                function(idx, paras) {
                    var head = list.head(paras);
                    var last = list.last(paras);

                    var headList = isEscapseToBody ? dom.lastAncestor(head, dom.isList) : head.parentNode;
                    var lastList = headList.childNodes.length > 1
                        ? dom.splitTree(headList,
                            {
                                node: last.parentNode,
                                offset: dom.position(last) + 1
                            },
                            {
                                isSkipPaddingBlankHTML: true
                            })
                        : null;

                    var middleList = dom.splitTree(headList,
                        {
                            node: head.parentNode,
                            offset: dom.position(head)
                        },
                        {
                            isSkipPaddingBlankHTML: true
                        });

                    paras = isEscapseToBody
                        ? dom.listDescendant(middleList, dom.isLi)
                        : list.from(middleList.childNodes).filter(dom.isLi);

                    // LI to P
                    if (isEscapseToBody || !dom.isList(headList.parentNode)) {
                        paras = paras.map(function(para) {
                            return dom.replace(para, "P");
                        });
                    }

                    $.each(list.from(paras).reverse(),
                        function(idx, para) {
                            dom.insertAfter(para, headList);
                        });

                    // remove empty lists
                    var rootLists = list.compact([headList, middleList, lastList]);
                    $.each(rootLists,
                        function(idx, rootList) {
                            var listNodes = [rootList].concat(dom.listDescendant(rootList, dom.isList));
                            $.each(listNodes.reverse(),
                                function(idx, listNode) {
                                    if (!dom.nodeLength(listNode)) {
                                        dom.remove(listNode, true);
                                    }
                                });
                        });

                    releasedParas = releasedParas.concat(paras);
                });

            return releasedParas;
        };
    };


    /**
     * @class editing.Typing
     *
     * Typing
     *
     */
    var Typing = function() {

        // a Bullet instance to toggle lists off
        var bullet = new Bullet();

        /**
         * insert tab
         *
         * @param {WrappedRange} rng
         * @param {Number} tabsize
         */
        this.insertTab = function(rng, tabsize) {
            var tab = dom.createText(new Array(tabsize + 1).join(dom.NBSP_CHAR));
            rng = rng.deleteContents();
            rng.insertNode(tab, true);

            rng = range.create(tab, tabsize);
            rng.select();
        };

        /**
         * insert paragraph
         */
        this.insertParagraph = function(editable) {
            var rng = range.create(editable);

            // deleteContents on range.
            rng = rng.deleteContents();

            // Wrap range if it needs to be wrapped by paragraph
            rng = rng.wrapBodyInlineWithPara();

            // finding paragraph
            var splitRoot = dom.ancestor(rng.sc, dom.isPara);

            var nextPara;
            // on paragraph: split paragraph
            if (splitRoot) {
                // if it is an empty line with li
                if (dom.isEmpty(splitRoot) && dom.isLi(splitRoot)) {
                    // toogle UL/OL and escape
                    bullet.toggleList(splitRoot.parentNode.nodeName);
                    return;
                    // if it is an empty line with para on blockquote
                } else if (dom.isEmpty(splitRoot) && dom.isPara(splitRoot) && dom.isBlockquote(splitRoot.parentNode)) {
                    // escape blockquote
                    dom.insertAfter(splitRoot, splitRoot.parentNode);
                    nextPara = splitRoot;
                    // if new line has content (not a line break)
                } else {
                    nextPara = dom.splitTree(splitRoot, rng.getStartPoint());

                    var emptyAnchors = dom.listDescendant(splitRoot, dom.isEmptyAnchor);
                    emptyAnchors = emptyAnchors.concat(dom.listDescendant(nextPara, dom.isEmptyAnchor));

                    $.each(emptyAnchors,
                        function(idx, anchor) {
                            dom.remove(anchor);
                        });

                    // replace empty heading or pre with P tag
                    if ((dom.isHeading(nextPara) || dom.isPre(nextPara)) && dom.isEmpty(nextPara)) {
                        nextPara = dom.replace(nextPara, "p");
                    }
                }
                // no paragraph: insert empty paragraph
            } else {
                var next = rng.sc.childNodes[rng.so];
                nextPara = $(dom.emptyPara)[0];
                if (next) {
                    rng.sc.insertBefore(nextPara, next);
                } else {
                    rng.sc.appendChild(nextPara);
                }
            }

            range.create(nextPara, 0).normalize().select().scrollIntoView(editable);
        };
    };

    /**
     * @class editing.Table
     *
     * Table
     *
     */
    var Table = function() {
        /**
         * handle tab key
         *
         * @param {WrappedRange} rng
         * @param {Boolean} isShift
         */
        this.tab = function(rng, isShift) {
            var cell = dom.ancestor(rng.commonAncestor(), dom.isCell);
            var table = dom.ancestor(cell, dom.isTable);
            var cells = dom.listDescendant(table, dom.isCell);

            var nextCell = list[isShift ? "prev" : "next"](cells, cell);
            if (nextCell) {
                range.create(nextCell, 0).select();
            }
        };

        /**
         * create empty table element
         *
         * @param {Number} rowCount
         * @param {Number} colCount
         * @return {Node}
         */
        this.createTable = function(colCount, rowCount, options) {
            var tds = [], tdHTML;
            for (var idxCol = 0; idxCol < colCount; idxCol++) {
                tds.push("<td>" + dom.blank + "</td>");
            }
            tdHTML = tds.join("");

            var trs = [], trHTML;
            for (var idxRow = 0; idxRow < rowCount; idxRow++) {
                trs.push("<tr>" + tdHTML + "</tr>");
            }
            trHTML = trs.join("");
            var $table = $("<table>" + trHTML + "</table>");
            if (options && options.tableClassName) {
                $table.addClass(options.tableClassName);
            }

            return $table[0];
        };
    };


    var KEY_BOGUS = "bogus";

    /**
     * @class Editor
     */
    var Editor = function(context) {
        var self = this;

        var $note = context.layoutInfo.note;
        var $editor = context.layoutInfo.editor;
        var $editable = context.layoutInfo.editable;
        var options = context.options;
        var lang = options.langInfo;

        var editable = $editable[0];
        var lastRange = null;

        var style = new Style();
        var table = new Table();
        var typing = new Typing();
        var bullet = new Bullet();
        var history = new History($editable);

        this.initialize = function() {
            // bind custom events
            $editable.on("keydown",
                function(event) {
                    if (event.keyCode === key.code.ENTER) {
                        context.triggerEvent("enter", event);
                    }
                    context.triggerEvent("keydown", event);

                    if (options.shortcuts && !event.isDefaultPrevented()) {
                        self.handleKeyMap(event);
                    }
                }).on("keyup",
                function(event) {
                    context.triggerEvent("keyup", event);
                }).on("focus",
                function(event) {
                    context.triggerEvent("focus", event);
                }).on("blur",
                function(event) {
                    context.triggerEvent("blur", event);
                }).on("mousedown",
                function(event) {
                    context.triggerEvent("mousedown", event);
                }).on("mouseup",
                function(event) {
                    context.triggerEvent("mouseup", event);
                }).on("scroll",
                function(event) {
                    context.triggerEvent("scroll", event);
                }).on("paste",
                function(event) {
                    context.triggerEvent("paste", event);
                });

            // init content before set event
            $editable.html(dom.html($note) || dom.emptyPara);

            // [workaround] IE doesn't have input events for contentEditable
            // - see: https://goo.gl/4bfIvA
            var changeEventName =
                agent.isMSIE ? "DOMCharacterDataModified DOMSubtreeModified DOMNodeInserted" : "input";
            $editable.on(changeEventName,
                function() {
                    context.triggerEvent("change", $editable.html());
                });

            $editor.on("focusin",
                function(event) {
                    context.triggerEvent("focusin", event);
                }).on("focusout",
                function(event) {
                    context.triggerEvent("focusout", event);
                });

            if (!options.airMode && options.height) {
                this.setHeight(options.height);
            }
            if (!options.airMode && options.maxHeight) {
                $editable.css("max-height", options.maxHeight);
            }
            if (!options.airMode && options.minHeight) {
                $editable.css("min-height", options.minHeight);
            }

            history.recordUndo();
        };

        this.destroy = function() {
            $editable.off();
        };

        this.handleKeyMap = function(event) {
            var keyMap = options.keyMap[agent.isMac ? "mac" : "pc"];
            var keys = [];

            if (event.metaKey) {
                keys.push("CMD");
            }
            if (event.ctrlKey && !event.altKey) {
                keys.push("CTRL");
            }
            if (event.shiftKey) {
                keys.push("SHIFT");
            }

            var keyName = key.nameFromCode[event.keyCode];
            if (keyName) {
                keys.push(keyName);
            }

            var eventName = keyMap[keys.join("+")];
            if (eventName) {
                event.preventDefault();
                context.invoke(eventName);
            } else if (key.isEdit(event.keyCode)) {
                this.afterCommand();
            }
        };

        /**
         * create range
         * @return {WrappedRange}
         */
        this.createRange = function() {
            this.focus();
            return range.create(editable);
        };

        /**
         * saveRange
         *
         * save current range
         *
         * @param {Boolean} [thenCollapse=false]
         */
        this.saveRange = function(thenCollapse) {
            lastRange = this.createRange();
            if (thenCollapse) {
                lastRange.collapse().select();
            }
        };

        /**
         * restoreRange
         *
         * restore lately range
         */
        this.restoreRange = function() {
            if (lastRange) {
                lastRange.select();
                this.focus();
            }
        };

        this.saveTarget = function(node) {
            $editable.data("target", node);
        };

        this.clearTarget = function() {
            $editable.removeData("target");
        };

        this.restoreTarget = function() {
            return $editable.data("target");
        };

        /**
         * currentStyle
         *
         * current style
         * @return {Object|Boolean} unfocus
         */
        this.currentStyle = function() {
            var rng = range.create();
            if (rng) {
                rng = rng.normalize();
            }
            return rng ? style.current(rng) : style.fromNode($editable);
        };

        /**
         * style from node
         *
         * @param {jQuery} $node
         * @return {Object}
         */
        this.styleFromNode = function($node) {
            return style.fromNode($node);
        };

        /**
         * undo
         */
        this.undo = function() {
            context.triggerEvent("before.command", $editable.html());
            history.undo();
            context.triggerEvent("change", $editable.html());
        };
        context.memo("help.undo", lang.help.undo);

        /**
         * redo
         */
        this.redo = function() {
            context.triggerEvent("before.command", $editable.html());
            history.redo();
            context.triggerEvent("change", $editable.html());
        };
        context.memo("help.redo", lang.help.redo);

        /**
         * before command
         */
        var beforeCommand = this.beforeCommand = function() {
            context.triggerEvent("before.command", $editable.html());
            // keep focus on editable before command execution
            self.focus();
        };

        /**
         * after command
         * @param {Boolean} isPreventTrigger
         */
        var afterCommand = this.afterCommand = function(isPreventTrigger) {
            history.recordUndo();
            if (!isPreventTrigger) {
                context.triggerEvent("change", $editable.html());
            }
        };

        /* jshint ignore:start */
        // native commands(with execCommand), generate function for execCommand
        var commands = [
            "bold", "italic", "underline", "strikethrough", "superscript", "subscript",
            "justifyLeft", "justifyCenter", "justifyRight", "justifyFull",
            "formatBlock", "removeFormat",
            "backColor", "foreColor", "fontName"
        ];

        for (var idx = 0, len = commands.length; idx < len; idx ++) {
            this[commands[idx]] = (function(sCmd) {
                return function(value) {
                    beforeCommand();
                    document.execCommand(sCmd, false, value);
                    afterCommand(true);
                };
            })(commands[idx]);
            context.memo("help." + commands[idx], lang.help[commands[idx]]);
        }
        /* jshint ignore:end */

        /**
         * handle tab key
         */
        this.tab = function() {
            var rng = this.createRange();
            if (rng.isCollapsed() && rng.isOnCell()) {
                table.tab(rng);
            } else {
                beforeCommand();
                typing.insertTab(rng, options.tabSize);
                afterCommand();
            }
        };
        context.memo("help.tab", lang.help.tab);

        /**
         * handle shift+tab key
         */
        this.untab = function() {
            var rng = this.createRange();
            if (rng.isCollapsed() && rng.isOnCell()) {
                table.tab(rng, true);
            }
        };
        context.memo("help.untab", lang.help.untab);

        /**
         * run given function between beforeCommand and afterCommand
         */
        this.wrapCommand = function(fn) {
            return function() {
                beforeCommand();
                fn.apply(self, arguments);
                afterCommand();
            };
        };

        /**
         * insert paragraph
         */
        this.insertParagraph = this.wrapCommand(function() {
            typing.insertParagraph(editable);
        });
        context.memo("help.insertParagraph", lang.help.insertParagraph);

        this.insertOrderedList = this.wrapCommand(function() {
            bullet.insertOrderedList(editable);
        });
        context.memo("help.insertOrderedList", lang.help.insertOrderedList);

        this.insertUnorderedList = this.wrapCommand(function() {
            bullet.insertUnorderedList(editable);
        });
        context.memo("help.insertUnorderedList", lang.help.insertUnorderedList);

        this.indent = this.wrapCommand(function() {
            bullet.indent(editable);
        });
        context.memo("help.indent", lang.help.indent);

        this.outdent = this.wrapCommand(function() {
            bullet.outdent(editable);
        });
        context.memo("help.outdent", lang.help.outdent);

        /**
         * insert image
         *
         * @param {String} src
         * @param {String|Function} param
         * @return {Promise}
         */
        this.insertImage = function(src, param) {
            return async.createImage(src, param).then(function($image) {
                beforeCommand();

                if (typeof param === "function") {
                    param($image);
                } else {
                    if (typeof param === "string") {
                        $image.attr("data-filename", param);
                    }
                    $image.css("width", Math.min($editable.width(), $image.width()));
                }

                $image.show();
                range.create(editable).insertNode($image[0]);
                range.createFromNodeAfter($image[0]).select();
                afterCommand();
            }).fail(function(e) {
                context.triggerEvent("image.upload.error", e);
            });
        };

        /**
         * insertImages
         * @param {File[]} files
         */
        this.insertImages = function(files) {
            $.each(files,
                function(idx, file) {
                    var filename = file.name;
                    if (options.maximumImageFileSize && options.maximumImageFileSize < file.size) {
                        context.triggerEvent("image.upload.error", lang.image.maximumFileSizeError);
                    } else {
                        async.readFileAsDataURL(file).then(function(dataURL) {
                            return self.insertImage(dataURL, filename);
                        }).fail(function() {
                            context.triggerEvent("image.upload.error");
                        });
                    }
                });
        };

        /**
         * insertImagesOrCallback
         * @param {File[]} files
         */
        this.insertImagesOrCallback = function(files) {
            var callbacks = options.callbacks;

            // If onImageUpload options setted
            if (callbacks.onImageUpload) {
                context.triggerEvent("image.upload", files);
                // else insert Image as dataURL
            } else {
                this.insertImages(files);
            }
        };

        /**
         * insertNode
         * insert node
         * @param {Node} node
         */
        this.insertNode = this.wrapCommand(function(node) {
            var rng = this.createRange();
            rng.insertNode(node);
            range.createFromNodeAfter(node).select();
        });

        /**
         * insert text
         * @param {String} text
         */
        this.insertText = this.wrapCommand(function(text) {
            var rng = this.createRange();
            var textNode = rng.insertNode(dom.createText(text));
            range.create(textNode, dom.nodeLength(textNode)).select();
        });

        /**
         * return selected plain text
         * @return {String} text
         */
        this.getSelectedText = function() {
            var rng = this.createRange();

            // if range on anchor, expand range with anchor
            if (rng.isOnAnchor()) {
                rng = range.createFromNode(dom.ancestor(rng.sc, dom.isAnchor));
            }

            return rng.toString();
        };

        /**
         * paste HTML
         * @param {String} markup
         */
        this.pasteHTML = this.wrapCommand(function(markup) {
            var contents = this.createRange().pasteHTML(markup);
            range.createFromNodeAfter(list.last(contents)).select();
        });

        /**
         * formatBlock
         *
         * @param {String} tagName
         */
        this.formatBlock = this.wrapCommand(function(tagName) {
            // [workaround] for MSIE, IE need `<`
            tagName = agent.isMSIE ? "<" + tagName + ">" : tagName;
            document.execCommand("FormatBlock", false, tagName);
        });

        this.formatPara = function() {
            this.formatBlock("P");
        };
        context.memo("help.formatPara", lang.help.formatPara);

        /* jshint ignore:start */
        for (var idx = 1; idx <= 6; idx ++) {
            this["formatH" + idx] = function(idx) {
                return function() {
                    this.formatBlock("H" + idx);
                };
            }(idx);
            context.memo("help.formatH" + idx, lang.help["formatH" + idx]);
        };
        /* jshint ignore:end */

        /**
         * fontSize
         *
         * @param {String} value - px
         */
        this.fontSize = function(value) {
            var rng = this.createRange();

            if (rng && rng.isCollapsed()) {
                var spans = style.styleNodes(rng);
                var firstSpan = list.head(spans);

                $(spans).css({
                    'font-size': value + "px"
                });

                // [workaround] added styled bogus span for style
                //  - also bogus character needed for cursor position
                if (firstSpan && !dom.nodeLength(firstSpan)) {
                    firstSpan.innerHTML = dom.ZERO_WIDTH_NBSP_CHAR;
                    range.createFromNodeAfter(firstSpan.firstChild).select();
                    $editable.data(KEY_BOGUS, firstSpan);
                }
            } else {
                beforeCommand();
                $(style.styleNodes(rng)).css({
                    'font-size': value + "px"
                });
                afterCommand();
            }
        };

        /**
         * insert horizontal rule
         */
        this.insertHorizontalRule = this.wrapCommand(function() {
            var hrNode = this.createRange().insertNode(dom.create("HR"));
            if (hrNode.nextSibling) {
                range.create(hrNode.nextSibling, 0).normalize().select();
            }
        });
        context.memo("help.insertHorizontalRule", lang.help.insertHorizontalRule);

        /**
         * remove bogus node and character
         */
        this.removeBogus = function() {
            var bogusNode = $editable.data(KEY_BOGUS);
            if (!bogusNode) {
                return;
            }

            var textNode = list.find(list.from(bogusNode.childNodes), dom.isText);

            var bogusCharIdx = textNode.nodeValue.indexOf(dom.ZERO_WIDTH_NBSP_CHAR);
            if (bogusCharIdx !== -1) {
                textNode.deleteData(bogusCharIdx, 1);
            }

            if (dom.isEmpty(bogusNode)) {
                dom.remove(bogusNode);
            }

            $editable.removeData(KEY_BOGUS);
        };

        /**
         * lineHeight
         * @param {String} value
         */
        this.lineHeight = this.wrapCommand(function(value) {
            style.stylePara(this.createRange(),
                {
                    lineHeight: value
                });
        });

        /**
         * unlink
         *
         * @type command
         */
        this.unlink = function() {
            var rng = this.createRange();
            if (rng.isOnAnchor()) {
                var anchor = dom.ancestor(rng.sc, dom.isAnchor);
                rng = range.createFromNode(anchor);
                rng.select();

                beforeCommand();
                document.execCommand("unlink");
                afterCommand();
            }
        };

        /**
         * create link (command)
         *
         * @param {Object} linkInfo
         */
        this.createLink = this.wrapCommand(function(linkInfo) {
            var linkUrl = linkInfo.url;
            var linkText = linkInfo.text;
            var isNewWindow = linkInfo.isNewWindow;
            var rng = linkInfo.range || this.createRange();
            var isTextChanged = rng.toString() !== linkText;

            if (options.onCreateLink) {
                linkUrl = options.onCreateLink(linkUrl);
            }

            var anchors = [];
            if (isTextChanged) {
                rng = rng.deleteContents();
                var anchor = rng.insertNode($("<A>" + linkText + "</A>")[0]);
                anchors.push(anchor);
            } else {
                anchors = style.styleNodes(rng,
                    {
                        nodeName: "A",
                        expandClosestSibling: true,
                        onlyPartialContains: true
                    });
            }

            $.each(anchors,
                function(idx, anchor) {
                    $(anchor).attr("href", linkUrl);
                    if (isNewWindow) {
                        $(anchor).attr("target", "_blank");
                    } else {
                        $(anchor).removeAttr("target");
                    }
                });

            var startRange = range.createFromNodeBefore(list.head(anchors));
            var startPoint = startRange.getStartPoint();
            var endRange = range.createFromNodeAfter(list.last(anchors));
            var endPoint = endRange.getEndPoint();

            range.create(
                startPoint.node,
                startPoint.offset,
                endPoint.node,
                endPoint.offset
            ).select();
        });

        /**
         * returns link info
         *
         * @return {Object}
         * @return {WrappedRange} return.range
         * @return {String} return.text
         * @return {Boolean} [return.isNewWindow=true]
         * @return {String} [return.url=""]
         */
        this.getLinkInfo = function() {
            var rng = this.createRange().expand(dom.isAnchor);

            // Get the first anchor on range(for edit).
            var $anchor = $(list.head(rng.nodes(dom.isAnchor)));

            return {
                range: rng,
                text: rng.toString(),
                isNewWindow: $anchor.length ? $anchor.attr("target") === "_blank" : false,
                url: $anchor.length ? $anchor.attr("href") : ""
            };
        };

        /**
         * setting color
         *
         * @param {Object} sObjColor  color code
         * @param {String} sObjColor.foreColor foreground color
         * @param {String} sObjColor.backColor background color
         */
        this.color = this.wrapCommand(function(colorInfo) {
            var foreColor = colorInfo.foreColor;
            var backColor = colorInfo.backColor;

            if (foreColor) {
                document.execCommand("foreColor", false, foreColor);
            }
            if (backColor) {
                document.execCommand("backColor", false, backColor);
            }
        });

        /**
         * insert Table
         *
         * @param {String} dimension of table (ex : "5x5")
         */
        this.insertTable = this.wrapCommand(function(dim) {
            var dimension = dim.split("x");

            var rng = this.createRange().deleteContents();
            rng.insertNode(table.createTable(dimension[0], dimension[1], options));
        });

        /**
         * float me
         *
         * @param {String} value
         */
        this.floatMe = this.wrapCommand(function(value) {
            var $target = $(this.restoreTarget());
            $target.css("float", value);
        });

        /**
         * resize overlay element
         * @param {String} value
         */
        this.resize = this.wrapCommand(function(value) {
            var $target = $(this.restoreTarget());
            $target.css({
                width: value * 100 + "%",
                height: ""
            });
        });

        /**
         * @param {Position} pos
         * @param {jQuery} $target - target element
         * @param {Boolean} [bKeepRatio] - keep ratio
         */
        this.resizeTo = function(pos, $target, bKeepRatio) {
            var imageSize;
            if (bKeepRatio) {
                var newRatio = pos.y / pos.x;
                var ratio = $target.data("ratio");
                imageSize = {
                    width: ratio > newRatio ? pos.x : pos.y / ratio,
                    height: ratio > newRatio ? pos.x * ratio : pos.y
                };
            } else {
                imageSize = {
                    width: pos.x,
                    height: pos.y
                };
            }

            $target.css(imageSize);
        };

        /**
         * remove media object
         */
        this.removeMedia = this.wrapCommand(function() {
            var $target = $(this.restoreTarget()).detach();
            context.triggerEvent("media.delete", $target, $editable);
        });

        /**
         * returns whether editable area has focus or not.
         */
        this.hasFocus = function() {
            return $editable.is(":focus");
        };

        /**
         * set focus
         */
        this.focus = function() {
            // [workaround] Screen will move when page is scolled in IE.
            //  - do focus when not focused
            if (!this.hasFocus()) {
                $editable.focus();
            }
        };

        /**
         * returns whether contents is empty or not.
         * @return {Boolean}
         */
        this.isEmpty = function() {
            return dom.isEmpty($editable[0]) || dom.emptyPara === $editable.html();
        };

        /**
         * Removes all contents and restores the editable instance to an _emptyPara_.
         */
        this.empty = function() {
            context.invoke("code", dom.emptyPara);
        };

        /**
         * set height for editable
         */
        this.setHeight = function(height) {
            $editable.outerHeight(height);
        };
    };

    var Clipboard = function(context) {
        var self = this;

        var $editable = context.layoutInfo.editable;

        this.events = {
            'summernote.keydown': function(we, e) {
                if (self.needKeydownHook()) {
                    if ((e.ctrlKey || e.metaKey) && e.keyCode === key.code.V) {
                        context.invoke("editor.saveRange");
                        self.$paste.focus();

                        setTimeout(function() {
                                self.pasteByHook();
                            },
                            0);
                    }
                }
            }
        };

        this.needKeydownHook = function() {
            return (agent.isMSIE && agent.browserVersion > 10) || agent.isFF;
        };

        this.initialize = function() {
            // [workaround] getting image from clipboard
            //  - IE11 and Firefox: CTRL+v hook
            //  - Webkit: event.clipboardData
            if (this.needKeydownHook()) {
                this.$paste = $("<div />").attr("contenteditable", true).css({
                    position: "absolute",
                    left: -100000,
                    opacity: 0
                });
                $editable.before(this.$paste);

                this.$paste.on("paste",
                    function(event) {
                        context.triggerEvent("paste", event);
                    });
            } else {
                $editable.on("paste", this.pasteByEvent);
            }
        };

        this.destroy = function() {
            if (this.needKeydownHook()) {
                this.$paste.remove();
                this.$paste = null;
            }
        };

        this.pasteByHook = function() {
            var node = this.$paste[0].firstChild;

            if (dom.isImg(node)) {
                var dataURI = node.src;
                var decodedData = atob(dataURI.split(",")[1]);
                var array = new Uint8Array(decodedData.length);
                for (var i = 0; i < decodedData.length; i++) {
                    array[i] = decodedData.charCodeAt(i);
                }

                var blob = new Blob([array], { type: "image/png" });
                blob.name = "clipboard.png";

                context.invoke("editor.restoreRange");
                context.invoke("editor.focus");
                context.invoke("editor.insertImagesOrCallback", [blob]);
            } else {
                var pasteContent = $("<div />").html(this.$paste.html()).html();
                context.invoke("editor.restoreRange");
                context.invoke("editor.focus");

                if (pasteContent) {
                    context.invoke("editor.pasteHTML", pasteContent);
                }
            }

            this.$paste.empty();
        };

        /**
         * paste by clipboard event
         *
         * @param {Event} event
         */
        this.pasteByEvent = function(event) {
            var clipboardData = event.originalEvent.clipboardData;
            if (clipboardData && clipboardData.items && clipboardData.items.length) {
                var item = list.head(clipboardData.items);
                if (item.kind === "file" && item.type.indexOf("image/") !== -1) {
                    context.invoke("editor.insertImagesOrCallback", [item.getAsFile()]);
                }
                context.invoke("editor.afterCommand");
            }
        };
    };

    var Dropzone = function(context) {
        var $document = $(document);
        var $editor = context.layoutInfo.editor;
        var $editable = context.layoutInfo.editable;
        var options = context.options;
        var lang = options.langInfo;

        var $dropzone = $([
            '<div class="note-dropzone">',
            '  <div class="note-dropzone-message"/>',
            "</div>"
        ].join("")).prependTo($editor);

        /**
         * attach Drag and Drop Events
         */
        this.initialize = function() {
            if (options.disableDragAndDrop) {
                // prevent default drop event
                $document.on("drop",
                    function(e) {
                        e.preventDefault();
                    });
            } else {
                this.attachDragAndDropEvent();
            }
        };

        /**
         * attach Drag and Drop Events
         */
        this.attachDragAndDropEvent = function() {
            var collection = $(),
                $dropzoneMessage = $dropzone.find(".note-dropzone-message");

            // show dropzone on dragenter when dragging a object to document
            // -but only if the editor is visible, i.e. has a positive width and height
            $document.on("dragenter",
                function(e) {
                    var isCodeview = context.invoke("codeview.isActivated");
                    var hasEditorSize = $editor.width() > 0 && $editor.height() > 0;
                    if (!isCodeview && !collection.length && hasEditorSize) {
                        $editor.addClass("dragover");
                        $dropzone.width($editor.width());
                        $dropzone.height($editor.height());
                        $dropzoneMessage.text(lang.image.dragImageHere);
                    }
                    collection = collection.add(e.target);
                }).on("dragleave",
                function(e) {
                    collection = collection.not(e.target);
                    if (!collection.length) {
                        $editor.removeClass("dragover");
                    }
                }).on("drop",
                function() {
                    collection = $();
                    $editor.removeClass("dragover");
                });

            // change dropzone's message on hover.
            $dropzone.on("dragenter",
                function() {
                    $dropzone.addClass("hover");
                    $dropzoneMessage.text(lang.image.dropImage);
                }).on("dragleave",
                function() {
                    $dropzone.removeClass("hover");
                    $dropzoneMessage.text(lang.image.dragImageHere);
                });

            // attach dropImage
            $dropzone.on("drop",
                function(event) {
                    var dataTransfer = event.originalEvent.dataTransfer;

                    if (dataTransfer && dataTransfer.files && dataTransfer.files.length) {
                        event.preventDefault();
                        $editable.focus();
                        context.invoke("editor.insertImagesOrCallback", dataTransfer.files);
                    } else {
                        $.each(dataTransfer.types,
                            function(idx, type) {
                                var content = dataTransfer.getData(type);

                                if (type.toLowerCase().indexOf("text") > -1) {
                                    context.invoke("editor.pasteHTML", content);
                                } else {
                                    $(content).each(function() {
                                        context.invoke("editor.insertNode", this);
                                    });
                                }
                            });
                    }
                }).on("dragover", false); // prevent default dragover event
        };
    };


    var CodeMirror;
    if (agent.hasCodeMirror) {
        if (agent.isSupportAmd) {
            require(["codemirror"],
                function(cm) {
                    CodeMirror = cm;
                });
        } else {
            CodeMirror = window.CodeMirror;
        }
    }

    /**
     * @class Codeview
     */
    var Codeview = function(context) {
        var $editor = context.layoutInfo.editor;
        var $editable = context.layoutInfo.editable;
        var $codable = context.layoutInfo.codable;
        var options = context.options;

        this.sync = function() {
            var isCodeview = this.isActivated();
            if (isCodeview && agent.hasCodeMirror) {
                $codable.data("cmEditor").save();
            }
        };

        /**
         * @return {Boolean}
         */
        this.isActivated = function() {
            return $editor.hasClass("codeview");
        };

        /**
         * toggle codeview
         */
        this.toggle = function() {
            if (this.isActivated()) {
                this.deactivate();
            } else {
                this.activate();
            }
            context.triggerEvent("codeview.toggled");
        };

        /**
         * activate code view
         */
        this.activate = function() {
            $codable.val(dom.html($editable, options.prettifyHtml));
            $codable.height($editable.height());

            context.invoke("toolbar.updateCodeview", true);
            $editor.addClass("codeview");
            $codable.focus();

            // activate CodeMirror as codable
            if (agent.hasCodeMirror) {
                var cmEditor = CodeMirror.fromTextArea($codable[0], options.codemirror);

                // CodeMirror TernServer
                if (options.codemirror.tern) {
                    var server = new CodeMirror.TernServer(options.codemirror.tern);
                    cmEditor.ternServer = server;
                    cmEditor.on("cursorActivity",
                        function(cm) {
                            server.updateArgHints(cm);
                        });
                }

                // CodeMirror hasn't Padding.
                cmEditor.setSize(null, $editable.outerHeight());
                $codable.data("cmEditor", cmEditor);
            }
        };

        /**
         * deactivate code view
         */
        this.deactivate = function() {
            // deactivate CodeMirror as codable
            if (agent.hasCodeMirror) {
                var cmEditor = $codable.data("cmEditor");
                $codable.val(cmEditor.getValue());
                cmEditor.toTextArea();
            }

            var value = dom.value($codable, options.prettifyHtml) || dom.emptyPara;
            var isChange = $editable.html() !== value;

            $editable.html(value);
            $editable.height(options.height ? $codable.height() : "auto");
            $editor.removeClass("codeview");

            if (isChange) {
                context.triggerEvent("change", $editable.html(), $editable);
            }

            $editable.focus();

            context.invoke("toolbar.updateCodeview", false);
        };

        this.destroy = function() {
            if (this.isActivated()) {
                this.deactivate();
            }
        };
    };

    var EDITABLE_PADDING = 24;

    var Statusbar = function(context) {
        var $document = $(document);
        var $statusbar = context.layoutInfo.statusbar;
        var $editable = context.layoutInfo.editable;
        var options = context.options;

        this.initialize = function() {
            if (options.airMode || options.disableResizeEditor) {
                return;
            }

            $statusbar.on("mousedown",
                function(event) {
                    event.preventDefault();
                    event.stopPropagation();

                    var editableTop = $editable.offset().top - $document.scrollTop();

                    $document.on("mousemove",
                        function(event) {
                            var height = event.clientY - (editableTop + EDITABLE_PADDING);

                            height = (options.minheight > 0) ? Math.max(height, options.minheight) : height;
                            height = (options.maxHeight > 0) ? Math.min(height, options.maxHeight) : height;

                            $editable.height(height);
                        }).one("mouseup",
                        function() {
                            $document.off("mousemove");
                        });
                });
        };

        this.destroy = function() {
            $statusbar.off();
        };
    };

    var Fullscreen = function(context) {
        var $editor = context.layoutInfo.editor;
        var $toolbar = context.layoutInfo.toolbar;
        var $editable = context.layoutInfo.editable;
        var $codable = context.layoutInfo.codable;

        var $window = $(window);
        var $scrollbar = $("html, body");

        /**
         * toggle fullscreen
         */
        this.toggle = function() {
            var resize = function(size) {
                $editable.css("height", size.h);
                $codable.css("height", size.h);
                if ($codable.data("cmeditor")) {
                    $codable.data("cmeditor").setsize(null, size.h);
                }
            };

            $editor.toggleClass("fullscreen");
            if (this.isFullscreen()) {
                $editable.data("orgHeight", $editable.css("height"));

                $window.on("resize",
                    function() {
                        resize({
                            h: $window.height() - $toolbar.outerHeight()
                        });
                    }).trigger("resize");

                $scrollbar.css("overflow", "hidden");
            } else {
                $window.off("resize");
                resize({
                    h: $editable.data("orgHeight")
                });
                $scrollbar.css("overflow", "visible");
            }

            context.invoke("toolbar.updateFullscreen", this.isFullscreen());
        };

        this.isFullscreen = function() {
            return $editor.hasClass("fullscreen");
        };
    };

    var Handle = function(context) {
        var self = this;

        var $document = $(document);
        var $editingArea = context.layoutInfo.editingArea;
        var options = context.options;

        this.events = {
            'summernote.mousedown': function(we, e) {
                if (self.update(e.target)) {
                    e.preventDefault();
                }
            },
            'summernote.keyup summernote.scroll summernote.change summernote.dialog.shown': function() {
                self.update();
            }
        };

        this.initialize = function() {
            this.$handle = $([
                '<div class="note-handle">',
                '<div class="note-control-selection">',
                '<div class="note-control-selection-bg"></div>',
                '<div class="note-control-holder note-control-nw"></div>',
                '<div class="note-control-holder note-control-ne"></div>',
                '<div class="note-control-holder note-control-sw"></div>',
                '<div class="',
                (options.disableResizeImage ? "note-control-holder" : "note-control-sizing"),
                ' note-control-se"></div>',
                (options.disableResizeImage ? "" : '<div class="note-control-selection-info"></div>'),
                "</div>",
                "</div>"
            ].join("")).prependTo($editingArea);

            this.$handle.on("mousedown",
                function(event) {
                    if (dom.isControlSizing(event.target)) {
                        event.preventDefault();
                        event.stopPropagation();

                        var $target = self.$handle.find(".note-control-selection").data("target"),
                            posStart = $target.offset(),
                            scrollTop = $document.scrollTop();

                        $document.on("mousemove",
                            function(event) {
                                context.invoke("editor.resizeTo",
                                    {
                                        x: event.clientX - posStart.left,
                                        y: event.clientY - (posStart.top - scrollTop)
                                    },
                                    $target,
                                    !event.shiftKey);

                                self.update($target[0]);
                            }).one("mouseup",
                            function(e) {
                                e.preventDefault();
                                $document.off("mousemove");
                                context.invoke("editor.afterCommand");
                            });

                        if (!$target.data("ratio")) { // original ratio.
                            $target.data("ratio", $target.height() / $target.width());
                        }
                    }
                });
        };

        this.destroy = function() {
            this.$handle.remove();
        };

        this.update = function(target) {
            var isImage = dom.isImg(target);
            var $selection = this.$handle.find(".note-control-selection");

            context.invoke("imagePopover.update", target);

            if (isImage) {
                var $image = $(target);
                var pos = $image.position();

                // include margin
                var imageSize = {
                    w: $image.outerWidth(true),
                    h: $image.outerHeight(true)
                };

                $selection.css({
                    display: "block",
                    left: pos.left,
                    top: pos.top,
                    width: imageSize.w,
                    height: imageSize.h
                }).data("target", $image); // save current image element.

                var sizingText = imageSize.w + "x" + imageSize.h;
                $selection.find(".note-control-selection-info").text(sizingText);
                context.invoke("editor.saveTarget", target);
            } else {
                this.hide();
            }

            return isImage;
        };

        /**
         * hide
         *
         * @param {jQuery} $handle
         */
        this.hide = function() {
            context.invoke("editor.clearTarget");
            this.$handle.children().hide();
        };
    };

    var AutoLink = function(context) {
        var self = this;
        var defaultScheme = "http://";
        var linkPattern = /^(https?:\/\/|ssh:\/\/|ftp:\/\/|file:\/|mailto:[A-Z0-9._%+-]+@)?(www\.)?(.+)$/i;

        this.events = {
            'summernote.keyup': function(we, e) {
                if (!e.isDefaultPrevented()) {
                    self.handleKeyup(e);
                }
            },
            'summernote.keydown': function(we, e) {
                self.handleKeydown(e);
            }
        };

        this.initialize = function() {
            this.lastWordRange = null;
        };

        this.destroy = function() {
            this.lastWordRange = null;
        };

        this.replace = function() {
            if (!this.lastWordRange) {
                return;
            }

            var keyword = this.lastWordRange.toString();
            var match = keyword.match(linkPattern);

            if (match && (match[1] || match[2])) {
                var link = match[1] ? keyword : defaultScheme + keyword;
                var node = $("<a />").html(keyword).attr("href", link)[0];

                this.lastWordRange.insertNode(node);
                this.lastWordRange = null;
                context.invoke("editor.focus");
            }

        };

        this.handleKeydown = function(e) {
            if (list.contains([key.code.ENTER, key.code.SPACE], e.keyCode)) {
                var wordRange = context.invoke("editor.createRange").getWordRange();
                this.lastWordRange = wordRange;
            }
        };

        this.handleKeyup = function(e) {
            if (list.contains([key.code.ENTER, key.code.SPACE], e.keyCode)) {
                this.replace();
            }
        };
    };

    /**
     * textarea auto sync.
     */
    var AutoSync = function(context) {
        var $note = context.layoutInfo.note;

        this.events = {
            'summernote.change': function() {
                $note.val(context.invoke("code"));
            }
        };

        this.shouldInitialize = function() {
            return dom.isTextarea($note[0]);
        };
    };

    var Placeholder = function(context) {
        var self = this;
        var $editingArea = context.layoutInfo.editingArea;
        var options = context.options;

        this.events = {
            'summernote.init summernote.change': function() {
                self.update();
            },
            'summernote.codeview.toggled': function() {
                self.update();
            }
        };

        this.shouldInitialize = function() {
            return !!options.placeholder;
        };

        this.initialize = function() {
            this.$placeholder = $('<div class="note-placeholder">');
            this.$placeholder.on("click",
                function() {
                    context.invoke("focus");
                }).text(options.placeholder).prependTo($editingArea);
        };

        this.destroy = function() {
            this.$placeholder.remove();
        };

        this.update = function() {
            var isShow = !context.invoke("codeview.isActivated") && context.invoke("editor.isEmpty");
            this.$placeholder.toggle(isShow);
        };
    };

    var Buttons = function(context) {
        var self = this;
        var ui = $.summernote.ui;

        var $toolbar = context.layoutInfo.toolbar;
        var options = context.options;
        var lang = options.langInfo;

        var invertedKeyMap = func.invertObject(options.keyMap[agent.isMac ? "mac" : "pc"]);

        var representShortcut = this.representShortcut = function(editorMethod) {
            var shortcut = invertedKeyMap[editorMethod];
            if (agent.isMac) {
                shortcut = shortcut.replace("CMD", "⌘").replace("SHIFT", "⇧");
            }

            shortcut = shortcut.replace("BACKSLASH", "\\")
                .replace("SLASH", "/")
                .replace("LEFTBRACKET", "[")
                .replace("RIGHTBRACKET", "]");

            return " (" + shortcut + ")";
        };

        this.initialize = function() {
            this.addToolbarButtons();
            this.addImagePopoverButtons();
            this.addLinkPopoverButtons();
            this.fontInstalledMap = {};
        };

        this.destroy = function() {
            delete this.fontInstalledMap;
        };

        this.isFontInstalled = function(name) {
            if (!self.fontInstalledMap.hasOwnProperty(name)) {
                self.fontInstalledMap[name] = agent.isFontInstalled(name) ||
                    list.contains(options.fontNamesIgnoreCheck, name);
            }

            return self.fontInstalledMap[name];
        };

        this.addToolbarButtons = function() {
            context.memo("button.style",
                function() {
                    return ui.buttonGroup([
                        ui.button({
                            className: "dropdown-toggle",
                            contents: ui.icon(options.icons.magic) + " " + ui.icon(options.icons.caret, "span"),
                            tooltip: lang.style.style,
                            data: {
                                toggle: "dropdown"
                            }
                        }),
                        ui.dropdown({
                            className: "dropdown-style",
                            items: context.options.styleTags,
                            template: function(item) {

                                if (typeof item === "string") {
                                    item = { tag: item, title: item };
                                }

                                var tag = item.tag;
                                var title = item.title;
                                var style = item.style ? ' style="' + item.style + '" ' : "";
                                var className = item.className ? ' className="' + item.className + '"' : "";

                                return "<" + tag + style + className + ">" + title + "</" + tag + ">";
                            },
                            click: context.createInvokeHandler("editor.formatBlock")
                        })
                    ]).render();
                });

            context.memo("button.bold",
                function() {
                    return ui.button({
                        className: "note-btn-bold",
                        contents: ui.icon(options.icons.bold),
                        tooltip: lang.font.bold + representShortcut("bold"),
                        click: context.createInvokeHandler("editor.bold")
                    }).render();
                });

            context.memo("button.italic",
                function() {
                    return ui.button({
                        className: "note-btn-italic",
                        contents: ui.icon(options.icons.italic),
                        tooltip: lang.font.italic + representShortcut("italic"),
                        click: context.createInvokeHandler("editor.italic")
                    }).render();
                });

            context.memo("button.underline",
                function() {
                    return ui.button({
                        className: "note-btn-underline",
                        contents: ui.icon(options.icons.underline),
                        tooltip: lang.font.underline + representShortcut("underline"),
                        click: context.createInvokeHandler("editor.underline")
                    }).render();
                });

            context.memo("button.clear",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.eraser),
                        tooltip: lang.font.clear + representShortcut("removeFormat"),
                        click: context.createInvokeHandler("editor.removeFormat")
                    }).render();
                });

            context.memo("button.strikethrough",
                function() {
                    return ui.button({
                        className: "note-btn-strikethrough",
                        contents: ui.icon(options.icons.strikethrough),
                        tooltip: lang.font.strikethrough + representShortcut("strikethrough"),
                        click: context.createInvokeHandler("editor.strikethrough")
                    }).render();
                });

            context.memo("button.superscript",
                function() {
                    return ui.button({
                        className: "note-btn-superscript",
                        contents: ui.icon(options.icons.superscript),
                        tooltip: lang.font.superscript,
                        click: context.createInvokeHandler("editor.superscript")
                    }).render();
                });

            context.memo("button.subscript",
                function() {
                    return ui.button({
                        className: "note-btn-subscript",
                        contents: ui.icon(options.icons.subscript),
                        tooltip: lang.font.subscript,
                        click: context.createInvokeHandler("editor.subscript")
                    }).render();
                });

            context.memo("button.fontname",
                function() {
                    return ui.buttonGroup([
                        ui.button({
                            className: "dropdown-toggle",
                            contents: '<span class="note-current-fontname"/> ' + ui.icon(options.icons.caret, "span"),
                            tooltip: lang.font.name,
                            data: {
                                toggle: "dropdown"
                            }
                        }),
                        ui.dropdownCheck({
                            className: "dropdown-fontname",
                            checkClassName: options.icons.menuCheck,
                            items: options.fontNames.filter(self.isFontInstalled),
                            template: function(item) {
                                return '<span style="font-family:' + item + '">' + item + "</span>";
                            },
                            click: context.createInvokeHandler("editor.fontName")
                        })
                    ]).render();
                });

            context.memo("button.fontsize",
                function() {
                    return ui.buttonGroup([
                        ui.button({
                            className: "dropdown-toggle",
                            contents: '<span class="note-current-fontsize"/>' + ui.icon(options.icons.caret, "span"),
                            tooltip: lang.font.size,
                            data: {
                                toggle: "dropdown"
                            }
                        }),
                        ui.dropdownCheck({
                            className: "dropdown-fontsize",
                            checkClassName: options.icons.menuCheck,
                            items: options.fontSizes,
                            click: context.createInvokeHandler("editor.fontSize")
                        })
                    ]).render();
                });

            context.memo("button.color",
                function() {
                    return ui.buttonGroup({
                        className: "note-color",
                        children: [
                            ui.button({
                                className: "note-current-color-button",
                                contents: ui.icon(options.icons.font + " note-recent-color"),
                                tooltip: lang.color.recent,
                                click: function(e) {
                                    var $button = $(e.currentTarget);
                                    context.invoke("editor.color",
                                        {
                                            backColor: $button.attr("data-backColor"),
                                            foreColor: $button.attr("data-foreColor")
                                        });
                                },
                                callback: function($button) {
                                    var $recentColor = $button.find(".note-recent-color");
                                    $recentColor.css("background-color", "#FFFF00");
                                    $button.attr("data-backColor", "#FFFF00");
                                }
                            }),
                            ui.button({
                                className: "dropdown-toggle",
                                contents: ui.icon(options.icons.caret, "span"),
                                tooltip: lang.color.more,
                                data: {
                                    toggle: "dropdown"
                                }
                            }),
                            ui.dropdown({
                                items: [
                                    "<li>",
                                    '<div class="btn-group">',
                                    '  <div class="note-palette-title">' + lang.color.background + "</div>",
                                    "  <div>",
                                    '    <button type="button" class="note-color-reset btn btn-default" data-event="backColor" data-value="inherit">',
                                    lang.color.transparent,
                                    "    </button>",
                                    "  </div>",
                                    '  <div class="note-holder" data-event="backColor"/>',
                                    "</div>",
                                    '<div class="btn-group">',
                                    '  <div class="note-palette-title">' + lang.color.foreground + "</div>",
                                    "  <div>",
                                    '    <button type="button" class="note-color-reset btn btn-default" data-event="removeFormat" data-value="foreColor">',
                                    lang.color.resetToDefault,
                                    "    </button>",
                                    "  </div>",
                                    '  <div class="note-holder" data-event="foreColor"/>',
                                    "</div>",
                                    "</li>"
                                ].join(""),
                                callback: function($dropdown) {
                                    $dropdown.find(".note-holder").each(function() {
                                        var $holder = $(this);
                                        $holder.append(ui.palette({
                                            colors: options.colors,
                                            eventName: $holder.data("event")
                                        }).render());
                                    });
                                },
                                click: function(event) {
                                    var $button = $(event.target);
                                    var eventName = $button.data("event");
                                    var value = $button.data("value");

                                    if (eventName && value) {
                                        var key = eventName === "backColor" ? "background-color" : "color";
                                        var $color = $button.closest(".note-color").find(".note-recent-color");
                                        var $currentButton = $button.closest(".note-color")
                                            .find(".note-current-color-button");

                                        $color.css(key, value);
                                        $currentButton.attr("data-" + eventName, value);
                                        context.invoke("editor." + eventName, value);
                                    }
                                }
                            })
                        ]
                    }).render();
                });

            context.memo("button.ul",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.unorderedlist),
                        tooltip: lang.lists.unordered + representShortcut("insertUnorderedList"),
                        click: context.createInvokeHandler("editor.insertUnorderedList")
                    }).render();
                });

            context.memo("button.ol",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.orderedlist),
                        tooltip: lang.lists.ordered + representShortcut("insertOrderedList"),
                        click: context.createInvokeHandler("editor.insertOrderedList")
                    }).render();
                });

            var justifyLeft = ui.button({
                contents: ui.icon(options.icons.alignLeft),
                tooltip: lang.paragraph.left + representShortcut("justifyLeft"),
                click: context.createInvokeHandler("editor.justifyLeft")
            });

            var justifyCenter = ui.button({
                contents: ui.icon(options.icons.alignCenter),
                tooltip: lang.paragraph.center + representShortcut("justifyCenter"),
                click: context.createInvokeHandler("editor.justifyCenter")
            });

            var justifyRight = ui.button({
                contents: ui.icon(options.icons.alignRight),
                tooltip: lang.paragraph.right + representShortcut("justifyRight"),
                click: context.createInvokeHandler("editor.justifyRight")
            });

            var justifyFull = ui.button({
                contents: ui.icon(options.icons.alignJustify),
                tooltip: lang.paragraph.justify + representShortcut("justifyFull"),
                click: context.createInvokeHandler("editor.justifyFull")
            });

            var outdent = ui.button({
                contents: ui.icon(options.icons.outdent),
                tooltip: lang.paragraph.outdent + representShortcut("outdent"),
                click: context.createInvokeHandler("editor.outdent")
            });

            var indent = ui.button({
                contents: ui.icon(options.icons.indent),
                tooltip: lang.paragraph.indent + representShortcut("indent"),
                click: context.createInvokeHandler("editor.indent")
            });

            context.memo("button.justifyLeft", func.invoke(justifyLeft, "render"));
            context.memo("button.justifyCenter", func.invoke(justifyCenter, "render"));
            context.memo("button.justifyRight", func.invoke(justifyRight, "render"));
            context.memo("button.justifyFull", func.invoke(justifyFull, "render"));
            context.memo("button.outdent", func.invoke(outdent, "render"));
            context.memo("button.indent", func.invoke(indent, "render"));

            context.memo("button.paragraph",
                function() {
                    return ui.buttonGroup([
                        ui.button({
                            className: "dropdown-toggle",
                            contents: ui.icon(options.icons.alignLeft) + " " + ui.icon(options.icons.caret, "span"),
                            tooltip: lang.paragraph.paragraph,
                            data: {
                                toggle: "dropdown"
                            }
                        }),
                        ui.dropdown([
                            ui.buttonGroup({
                                className: "note-align",
                                children: [justifyLeft, justifyCenter, justifyRight, justifyFull]
                            }),
                            ui.buttonGroup({
                                className: "note-list",
                                children: [outdent, indent]
                            })
                        ])
                    ]).render();
                });

            context.memo("button.height",
                function() {
                    return ui.buttonGroup([
                        ui.button({
                            className: "dropdown-toggle",
                            contents: ui.icon(options.icons.textHeight) + " " + ui.icon(options.icons.caret, "span"),
                            tooltip: lang.font.height,
                            data: {
                                toggle: "dropdown"
                            }
                        }),
                        ui.dropdownCheck({
                            items: options.lineHeights,
                            checkClassName: options.icons.menuCheck,
                            className: "dropdown-line-height",
                            click: context.createInvokeHandler("editor.lineHeight")
                        })
                    ]).render();
                });

            context.memo("button.table",
                function() {
                    return ui.buttonGroup([
                            ui.button({
                                className: "dropdown-toggle",
                                contents: ui.icon(options.icons.table) + " " + ui.icon(options.icons.caret, "span"),
                                tooltip: lang.table.table,
                                data: {
                                    toggle: "dropdown"
                                }
                            }),
                            ui.dropdown({
                                className: "note-table",
                                items: [
                                    '<div class="note-dimension-picker">',
                                    '  <div class="note-dimension-picker-mousecatcher" data-event="insertTable" data-value="1x1"/>',
                                    '  <div class="note-dimension-picker-highlighted"/>',
                                    '  <div class="note-dimension-picker-unhighlighted"/>',
                                    "</div>",
                                    '<div class="note-dimension-display">1 x 1</div>'
                                ].join("")
                            })
                        ],
                        {
                            callback: function($node) {
                                var $catcher = $node.find(".note-dimension-picker-mousecatcher");
                                $catcher.css({
                                        width: options.insertTableMaxSize.col + "em",
                                        height: options.insertTableMaxSize.row + "em"
                                    }).mousedown(context.createInvokeHandler("editor.insertTable"))
                                    .on("mousemove", self.tableMoveHandler);
                            }
                        }).render();
                });

            context.memo("button.link",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.link),
                        tooltip: lang.link.link,
                        click: context.createInvokeHandler("linkDialog.show")
                    }).render();
                });

            context.memo("button.picture",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.picture),
                        tooltip: lang.image.image,
                        click: context.createInvokeHandler("imageDialog.show")
                    }).render();
                });

            context.memo("button.video",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.video),
                        tooltip: lang.video.video,
                        click: context.createInvokeHandler("videoDialog.show")
                    }).render();
                });

            context.memo("button.hr",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.minus),
                        tooltip: lang.hr.insert + representShortcut("insertHorizontalRule"),
                        click: context.createInvokeHandler("editor.insertHorizontalRule")
                    }).render();
                });

            context.memo("button.fullscreen",
                function() {
                    return ui.button({
                        className: "btn-fullscreen",
                        contents: ui.icon(options.icons.arrowsAlt),
                        tooltip: lang.options.fullscreen,
                        click: context.createInvokeHandler("fullscreen.toggle")
                    }).render();
                });

            context.memo("button.codeview",
                function() {
                    return ui.button({
                        className: "btn-codeview",
                        contents: ui.icon(options.icons.code),
                        tooltip: lang.options.codeview,
                        click: context.createInvokeHandler("codeview.toggle")
                    }).render();
                });

            context.memo("button.redo",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.redo),
                        tooltip: lang.history.redo + representShortcut("redo"),
                        click: context.createInvokeHandler("editor.redo")
                    }).render();
                });

            context.memo("button.undo",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.undo),
                        tooltip: lang.history.undo + representShortcut("undo"),
                        click: context.createInvokeHandler("editor.undo")
                    }).render();
                });

            context.memo("button.help",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.question),
                        tooltip: lang.options.help,
                        click: context.createInvokeHandler("helpDialog.show")
                    }).render();
                });
        };

        /**
         * image : [
         *   ['imagesize', ['imageSize100', 'imageSize50', 'imageSize25']],
         *   ['float', ['floatLeft', 'floatRight', 'floatNone' ]],
         *   ['remove', ['removeMedia']]
         * ],
         */
        this.addImagePopoverButtons = function() {
            // Image Size Buttons
            context.memo("button.imageSize100",
                function() {
                    return ui.button({
                        contents: '<span class="note-fontsize-10">100%</span>',
                        tooltip: lang.image.resizeFull,
                        click: context.createInvokeHandler("editor.resize", "1")
                    }).render();
                });
            context.memo("button.imageSize50",
                function() {
                    return ui.button({
                        contents: '<span class="note-fontsize-10">50%</span>',
                        tooltip: lang.image.resizeHalf,
                        click: context.createInvokeHandler("editor.resize", "0.5")
                    }).render();
                });
            context.memo("button.imageSize25",
                function() {
                    return ui.button({
                        contents: '<span class="note-fontsize-10">25%</span>',
                        tooltip: lang.image.resizeQuarter,
                        click: context.createInvokeHandler("editor.resize", "0.25")
                    }).render();
                });

            // Float Buttons
            context.memo("button.floatLeft",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.alignLeft),
                        tooltip: lang.image.floatLeft,
                        click: context.createInvokeHandler("editor.floatMe", "left")
                    }).render();
                });

            context.memo("button.floatRight",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.alignRight),
                        tooltip: lang.image.floatRight,
                        click: context.createInvokeHandler("editor.floatMe", "right")
                    }).render();
                });

            context.memo("button.floatNone",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.alignJustify),
                        tooltip: lang.image.floatNone,
                        click: context.createInvokeHandler("editor.floatMe", "none")
                    }).render();
                });

            // Remove Buttons
            context.memo("button.removeMedia",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.trash),
                        tooltip: lang.image.remove,
                        click: context.createInvokeHandler("editor.removeMedia")
                    }).render();
                });
        };

        this.addLinkPopoverButtons = function() {
            context.memo("button.linkDialogShow",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.link),
                        tooltip: lang.link.edit,
                        click: context.createInvokeHandler("linkDialog.show")
                    }).render();
                });

            context.memo("button.unlink",
                function() {
                    return ui.button({
                        contents: ui.icon(options.icons.unlink),
                        tooltip: lang.link.unlink,
                        click: context.createInvokeHandler("editor.unlink")
                    }).render();
                });
        };

        this.build = function($container, groups) {
            for (var groupIdx = 0, groupLen = groups.length; groupIdx < groupLen; groupIdx++) {
                var group = groups[groupIdx];
                var groupName = group[0];
                var buttons = group[1];

                var $group = ui.buttonGroup({
                    className: "note-" + groupName
                }).render();

                for (var idx = 0, len = buttons.length; idx < len; idx++) {
                    var button = context.memo("button." + buttons[idx]);
                    if (button) {
                        $group.append(typeof button === "function" ? button(context) : button);
                    }
                }
                $group.appendTo($container);
            }
        };

        this.updateCurrentStyle = function() {
            var styleInfo = context.invoke("editor.currentStyle");
            this.updateBtnStates({
                '.note-btn-bold': function() {
                    return styleInfo["font-bold"] === "bold";
                },
                '.note-btn-italic': function() {
                    return styleInfo["font-italic"] === "italic";
                },
                '.note-btn-underline': function() {
                    return styleInfo["font-underline"] === "underline";
                },
                '.note-btn-subscript': function() {
                    return styleInfo["font-subscript"] === "subscript";
                },
                '.note-btn-superscript': function() {
                    return styleInfo["font-superscript"] === "superscript";
                },
                '.note-btn-strikethrough': function() {
                    return styleInfo["font-strikethrough"] === "strikethrough";
                }
            });

            if (styleInfo["font-family"]) {
                var fontNames = styleInfo["font-family"].split(",").map(function(name) {
                    return name.replace(/[\'\"]/g, "")
                        .replace(/\s+$/, "")
                        .replace(/^\s+/, "");
                });
                var fontName = list.find(fontNames, self.isFontInstalled);

                $toolbar.find(".dropdown-fontname li a").each(function() {
                    // always compare string to avoid creating another func.
                    var isChecked = ($(this).data("value") + "") === (fontName + "");
                    this.className = isChecked ? "checked" : "";
                });
                $toolbar.find(".note-current-fontname").text(fontName);
            }

            if (styleInfo["font-size"]) {
                var fontSize = styleInfo["font-size"];
                $toolbar.find(".dropdown-fontsize li a").each(function() {
                    // always compare with string to avoid creating another func.
                    var isChecked = ($(this).data("value") + "") === (fontSize + "");
                    this.className = isChecked ? "checked" : "";
                });
                $toolbar.find(".note-current-fontsize").text(fontSize);
            }

            if (styleInfo["line-height"]) {
                var lineHeight = styleInfo["line-height"];
                $toolbar.find(".dropdown-line-height li a").each(function() {
                    // always compare with string to avoid creating another func.
                    var isChecked = ($(this).data("value") + "") === (lineHeight + "");
                    this.className = isChecked ? "checked" : "";
                });
            }
        };

        this.updateBtnStates = function(infos) {
            $.each(infos,
                function(selector, pred) {
                    ui.toggleBtnActive($toolbar.find(selector), pred());
                });
        };

        this.tableMoveHandler = function(event) {
            var PX_PER_EM = 18;
            var $picker = $(event.target.parentNode); // target is mousecatcher
            var $dimensionDisplay = $picker.next();
            var $catcher = $picker.find(".note-dimension-picker-mousecatcher");
            var $highlighted = $picker.find(".note-dimension-picker-highlighted");
            var $unhighlighted = $picker.find(".note-dimension-picker-unhighlighted");

            var posOffset;
            // HTML5 with jQuery - e.offsetX is undefined in Firefox
            if (event.offsetX === undefined) {
                var posCatcher = $(event.target).offset();
                posOffset = {
                    x: event.pageX - posCatcher.left,
                    y: event.pageY - posCatcher.top
                };
            } else {
                posOffset = {
                    x: event.offsetX,
                    y: event.offsetY
                };
            }

            var dim = {
                c: Math.ceil(posOffset.x / PX_PER_EM) || 1,
                r: Math.ceil(posOffset.y / PX_PER_EM) || 1
            };

            $highlighted.css({ width: dim.c + "em", height: dim.r + "em" });
            $catcher.data("value", dim.c + "x" + dim.r);

            if (3 < dim.c && dim.c < options.insertTableMaxSize.col) {
                $unhighlighted.css({ width: dim.c + 1 + "em" });
            }

            if (3 < dim.r && dim.r < options.insertTableMaxSize.row) {
                $unhighlighted.css({ height: dim.r + 1 + "em" });
            }

            $dimensionDisplay.html(dim.c + " x " + dim.r);
        };
    };

    var Toolbar = function(context) {
        var ui = $.summernote.ui;

        var $note = context.layoutInfo.note;
        var $toolbar = context.layoutInfo.toolbar;
        var options = context.options;

        this.shouldInitialize = function() {
            return !options.airMode;
        };

        this.initialize = function() {
            options.toolbar = options.toolbar || [];

            if (!options.toolbar.length) {
                $toolbar.hide();
            } else {
                context.invoke("buttons.build", $toolbar, options.toolbar);
            }

            if (options.toolbarContainer) {
                $toolbar.appendTo(options.toolbarContainer);
            }

            $note.on("summernote.keyup summernote.mouseup summernote.change",
                function() {
                    context.invoke("buttons.updateCurrentStyle");
                });

            context.invoke("buttons.updateCurrentStyle");
        };

        this.destroy = function() {
            $toolbar.children().remove();
        };

        this.updateFullscreen = function(isFullscreen) {
            ui.toggleBtnActive($toolbar.find(".btn-fullscreen"), isFullscreen);
        };

        this.updateCodeview = function(isCodeview) {
            ui.toggleBtnActive($toolbar.find(".btn-codeview"), isCodeview);
            if (isCodeview) {
                this.deactivate();
            } else {
                this.activate();
            }
        };

        this.activate = function(isIncludeCodeview) {
            var $btn = $toolbar.find("button");
            if (!isIncludeCodeview) {
                $btn = $btn.not(".btn-codeview");
            }
            ui.toggleBtn($btn, true);
        };

        this.deactivate = function(isIncludeCodeview) {
            var $btn = $toolbar.find("button");
            if (!isIncludeCodeview) {
                $btn = $btn.not(".btn-codeview");
            }
            ui.toggleBtn($btn, false);
        };
    };

    var LinkDialog = function(context) {
        var self = this;
        var ui = $.summernote.ui;

        var $editor = context.layoutInfo.editor;
        var options = context.options;
        var lang = options.langInfo;

        this.initialize = function() {
            var $container = options.dialogsInBody ? $(document.body) : $editor;

            var body = '<div class="form-group">' +
                "<label>" +
                lang.link.textToDisplay +
                "</label>" +
                '<input class="note-link-text form-control" type="text" />' +
                "</div>" +
                '<div class="form-group">' +
                "<label>" +
                lang.link.url +
                "</label>" +
                '<input class="note-link-url form-control" type="text" value="http://" />' +
                "</div>" +
                (!options.disableLinkTarget
                    ? '<div class="checkbox">' +
                    "<label>" +
                    '<input type="checkbox" checked> ' +
                    lang.link.openInNewWindow +
                    "</label>" +
                    "</div>"
                    : ""
                );
            var footer = '<button href="#" class="btn btn-primary note-link-btn disabled" disabled>' +
                lang.link.insert +
                "</button>";

            this.$dialog = ui.dialog({
                className: "link-dialog",
                title: lang.link.insert,
                fade: options.dialogsFade,
                body: body,
                footer: footer
            }).render().appendTo($container);
        };

        this.destroy = function() {
            ui.hideDialog(this.$dialog);
            this.$dialog.remove();
        };

        this.bindEnterKey = function($input, $btn) {
            $input.on("keypress",
                function(event) {
                    if (event.keyCode === key.code.ENTER) {
                        $btn.trigger("click");
                    }
                });
        };

        /**
         * Show link dialog and set event handlers on dialog controls.
         *
         * @param {Object} linkInfo
         * @return {Promise}
         */
        this.showLinkDialog = function(linkInfo) {
            return $.Deferred(function(deferred) {
                var $linkText = self.$dialog.find(".note-link-text"),
                    $linkUrl = self.$dialog.find(".note-link-url"),
                    $linkBtn = self.$dialog.find(".note-link-btn"),
                    $openInNewWindow = self.$dialog.find("input[type=checkbox]");

                ui.onDialogShown(self.$dialog,
                    function() {
                        context.triggerEvent("dialog.shown");

                        $linkText.val(linkInfo.text);

                        $linkText.on("input",
                            function() {
                                ui.toggleBtn($linkBtn, $linkText.val() && $linkUrl.val());
                                // if linktext was modified by keyup,
                                // stop cloning text from linkUrl
                                linkInfo.text = $linkText.val();
                            });

                        // if no url was given, copy text to url
                        if (!linkInfo.url) {
                            linkInfo.url = linkInfo.text || "http://";
                            ui.toggleBtn($linkBtn, linkInfo.text);
                        }

                        $linkUrl.on("input",
                            function() {
                                ui.toggleBtn($linkBtn, $linkText.val() && $linkUrl.val());
                                // display same link on `Text to display` input
                                // when create a new link
                                if (!linkInfo.text) {
                                    $linkText.val($linkUrl.val());
                                }
                            }).val(linkInfo.url).trigger("focus");

                        self.bindEnterKey($linkUrl, $linkBtn);
                        self.bindEnterKey($linkText, $linkBtn);

                        $openInNewWindow.prop("checked", linkInfo.isNewWindow);

                        $linkBtn.one("click",
                            function(event) {
                                event.preventDefault();

                                deferred.resolve({
                                    range: linkInfo.range,
                                    url: $linkUrl.val(),
                                    text: $linkText.val(),
                                    isNewWindow: $openInNewWindow.is(":checked")
                                });
                                self.$dialog.modal("hide");
                            });
                    });

                ui.onDialogHidden(self.$dialog,
                    function() {
                        // detach events
                        $linkText.off("input keypress");
                        $linkUrl.off("input keypress");
                        $linkBtn.off("click");

                        if (deferred.state() === "pending") {
                            deferred.reject();
                        }
                    });

                ui.showDialog(self.$dialog);
            }).promise();
        };

        /**
         * @param {Object} layoutInfo
         */
        this.show = function() {
            var linkInfo = context.invoke("editor.getLinkInfo");

            context.invoke("editor.saveRange");
            this.showLinkDialog(linkInfo).then(function(linkInfo) {
                context.invoke("editor.restoreRange");
                context.invoke("editor.createLink", linkInfo);
            }).fail(function() {
                context.invoke("editor.restoreRange");
            });
        };
        context.memo("help.linkDialog.show", options.langInfo.help["linkDialog.show"]);
    };

    var LinkPopover = function(context) {
        var self = this;
        var ui = $.summernote.ui;

        var options = context.options;

        this.events = {
            'summernote.keyup summernote.mouseup summernote.change summernote.scroll': function() {
                self.update();
            },
            'summernote.dialog.shown': function() {
                self.hide();
            }
        };

        this.shouldInitialize = function() {
            return !list.isEmpty(options.popover.link);
        };

        this.initialize = function() {
            this.$popover = ui.popover({
                className: "note-link-popover",
                callback: function($node) {
                    var $content = $node.find(".popover-content");
                    $content.prepend('<span><a target="_blank"></a>&nbsp;</span>');
                }
            }).render().appendTo("body");
            var $content = this.$popover.find(".popover-content");

            context.invoke("buttons.build", $content, options.popover.link);
        };

        this.destroy = function() {
            this.$popover.remove();
        };

        this.update = function() {
            // Prevent focusing on editable when invoke('code') is executed
            if (!context.invoke("editor.hasFocus")) {
                this.hide();
                return;
            }

            var rng = context.invoke("editor.createRange");
            if (rng.isCollapsed() && rng.isOnAnchor()) {
                var anchor = dom.ancestor(rng.sc, dom.isAnchor);
                var href = $(anchor).attr("href");
                this.$popover.find("a").attr("href", href).html(href);

                var pos = dom.posFromPlaceholder(anchor);
                this.$popover.css({
                    display: "block",
                    left: pos.left,
                    top: pos.top
                });
            } else {
                this.hide();
            }
        };

        this.hide = function() {
            this.$popover.hide();
        };
    };

    var ImageDialog = function(context) {
        var self = this;
        var ui = $.summernote.ui;

        var $editor = context.layoutInfo.editor;
        var options = context.options;
        var lang = options.langInfo;

        this.initialize = function() {
            var $container = options.dialogsInBody ? $(document.body) : $editor;

            var imageLimitation = "";
            if (options.maximumImageFileSize) {
                var unit = Math.floor(Math.log(options.maximumImageFileSize) / Math.log(1024));
                var readableSize = (options.maximumImageFileSize / Math.pow(1024, unit)).toFixed(2) * 1 +
                    " " +
                    " KMGTP"[unit] +
                    "B";
                imageLimitation = "<small>" + lang.image.maximumFileSize + " : " + readableSize + "</small>";
            }

            var body = '<div class="form-group note-group-select-from-files">' +
                "<label>" +
                lang.image.selectFromFiles +
                "</label>" +
                '<input class="note-image-input form-control" type="file" name="files" accept="image/*" multiple="multiple" />' +
                imageLimitation +
                "</div>" +
                '<div class="form-group" style="overflow:auto;">' +
                "<label>" +
                lang.image.url +
                "</label>" +
                '<input class="note-image-url form-control col-md-12" type="text" />' +
                "</div>";
            var footer = '<button href="#" class="btn btn-primary note-image-btn disabled" disabled>' +
                lang.image.insert +
                "</button>";

            this.$dialog = ui.dialog({
                title: lang.image.insert,
                fade: options.dialogsFade,
                body: body,
                footer: footer
            }).render().appendTo($container);
        };

        this.destroy = function() {
            ui.hideDialog(this.$dialog);
            this.$dialog.remove();
        };

        this.bindEnterKey = function($input, $btn) {
            $input.on("keypress",
                function(event) {
                    if (event.keyCode === key.code.ENTER) {
                        $btn.trigger("click");
                    }
                });
        };

        this.show = function() {
            context.invoke("editor.saveRange");
            this.showImageDialog().then(function(data) {
                // [workaround] hide dialog before restore range for IE range focus
                ui.hideDialog(self.$dialog);
                context.invoke("editor.restoreRange");

                if (typeof data === "string") { // image url
                    context.invoke("editor.insertImage", data);
                } else { // array of files
                    context.invoke("editor.insertImagesOrCallback", data);
                }
            }).fail(function() {
                context.invoke("editor.restoreRange");
            });
        };

        /**
         * show image dialog
         *
         * @param {jQuery} $dialog
         * @return {Promise}
         */
        this.showImageDialog = function() {
            return $.Deferred(function(deferred) {
                var $imageInput = self.$dialog.find(".note-image-input"),
                    $imageUrl = self.$dialog.find(".note-image-url"),
                    $imageBtn = self.$dialog.find(".note-image-btn");

                ui.onDialogShown(self.$dialog,
                    function() {
                        context.triggerEvent("dialog.shown");

                        // Cloning imageInput to clear element.
                        $imageInput.replaceWith($imageInput.clone()
                            .on("change",
                                function() {
                                    deferred.resolve(this.files || this.value);
                                })
                            .val("")
                        );

                        $imageBtn.click(function(event) {
                            event.preventDefault();

                            deferred.resolve($imageUrl.val());
                        });

                        $imageUrl.on("keyup paste",
                            function() {
                                var url = $imageUrl.val();
                                ui.toggleBtn($imageBtn, url);
                            }).val("").trigger("focus");
                        self.bindEnterKey($imageUrl, $imageBtn);
                    });

                ui.onDialogHidden(self.$dialog,
                    function() {
                        $imageInput.off("change");
                        $imageUrl.off("keyup paste keypress");
                        $imageBtn.off("click");

                        if (deferred.state() === "pending") {
                            deferred.reject();
                        }
                    });

                ui.showDialog(self.$dialog);
            });
        };
    };

    var ImagePopover = function(context) {
        var ui = $.summernote.ui;

        var options = context.options;

        this.shouldInitialize = function() {
            return !list.isEmpty(options.popover.image);
        };

        this.initialize = function() {
            this.$popover = ui.popover({
                className: "note-image-popover"
            }).render().appendTo("body");
            var $content = this.$popover.find(".popover-content");

            context.invoke("buttons.build", $content, options.popover.image);
        };

        this.destroy = function() {
            this.$popover.remove();
        };

        this.update = function(target) {
            if (dom.isImg(target)) {
                var pos = dom.posFromPlaceholder(target);
                this.$popover.css({
                    display: "block",
                    left: pos.left,
                    top: pos.top
                });
            } else {
                this.hide();
            }
        };

        this.hide = function() {
            this.$popover.hide();
        };
    };

    var VideoDialog = function(context) {
        var self = this;
        var ui = $.summernote.ui;

        var $editor = context.layoutInfo.editor;
        var options = context.options;
        var lang = options.langInfo;

        this.initialize = function() {
            var $container = options.dialogsInBody ? $(document.body) : $editor;

            var body = '<div class="form-group row-fluid">' +
                "<label>" +
                lang.video.url +
                ' <small class="text-muted">' +
                lang.video.providers +
                "</small></label>" +
                '<input class="note-video-url form-control span12" type="text" />' +
                "</div>";
            var footer = '<button href="#" class="btn btn-primary note-video-btn disabled" disabled>' +
                lang.video.insert +
                "</button>";

            this.$dialog = ui.dialog({
                title: lang.video.insert,
                fade: options.dialogsFade,
                body: body,
                footer: footer
            }).render().appendTo($container);
        };

        this.destroy = function() {
            ui.hideDialog(this.$dialog);
            this.$dialog.remove();
        };

        this.bindEnterKey = function($input, $btn) {
            $input.on("keypress",
                function(event) {
                    if (event.keyCode === key.code.ENTER) {
                        $btn.trigger("click");
                    }
                });
        };

        this.createVideoNode = function(url) {
            // video url patterns(youtube, instagram, vimeo, dailymotion, youku, mp4, ogg, webm)
            var ytRegExp =
                /^(?:https?:\/\/)?(?:www\.)?(?:youtu\.be\/|youtube\.com\/(?:embed\/|v\/|watch\?v=|watch\?.+&v=))((\w|-){11})(?:\S+)?$/;
            var ytMatch = url.match(ytRegExp);

            var igRegExp = /\/\/instagram.com\/p\/(.[a-zA-Z0-9_-]*)/;
            var igMatch = url.match(igRegExp);

            var vRegExp = /\/\/vine.co\/v\/(.[a-zA-Z0-9]*)/;
            var vMatch = url.match(vRegExp);

            var vimRegExp = /\/\/(player.)?vimeo.com\/([a-z]*\/)*([0-9]{6,11})[?]?.*/;
            var vimMatch = url.match(vimRegExp);

            var dmRegExp = /.+dailymotion.com\/(video|hub)\/([^_]+)[^#]*(#video=([^_&]+))?/;
            var dmMatch = url.match(dmRegExp);

            var youkuRegExp = /\/\/v\.youku\.com\/v_show\/id_(\w+)=*\.html/;
            var youkuMatch = url.match(youkuRegExp);

            var mp4RegExp = /^.+.(mp4|m4v)$/;
            var mp4Match = url.match(mp4RegExp);

            var oggRegExp = /^.+.(ogg|ogv)$/;
            var oggMatch = url.match(oggRegExp);

            var webmRegExp = /^.+.(webm)$/;
            var webmMatch = url.match(webmRegExp);

            var $video;
            if (ytMatch && ytMatch[1].length === 11) {
                var youtubeId = ytMatch[1];
                $video = $("<iframe>")
                    .attr("frameborder", 0)
                    .attr("src", "//www.youtube.com/embed/" + youtubeId)
                    .attr("width", "640").attr("height", "360");
            } else if (igMatch && igMatch[0].length) {
                $video = $("<iframe>")
                    .attr("frameborder", 0)
                    .attr("src", igMatch[0] + "/embed/")
                    .attr("width", "612").attr("height", "710")
                    .attr("scrolling", "no")
                    .attr("allowtransparency", "true");
            } else if (vMatch && vMatch[0].length) {
                $video = $("<iframe>")
                    .attr("frameborder", 0)
                    .attr("src", vMatch[0] + "/embed/simple")
                    .attr("width", "600").attr("height", "600")
                    .attr("class", "vine-embed");
            } else if (vimMatch && vimMatch[3].length) {
                $video = $("<iframe webkitallowfullscreen mozallowfullscreen allowfullscreen>")
                    .attr("frameborder", 0)
                    .attr("src", "//player.vimeo.com/video/" + vimMatch[3])
                    .attr("width", "640").attr("height", "360");
            } else if (dmMatch && dmMatch[2].length) {
                $video = $("<iframe>")
                    .attr("frameborder", 0)
                    .attr("src", "//www.dailymotion.com/embed/video/" + dmMatch[2])
                    .attr("width", "640").attr("height", "360");
            } else if (youkuMatch && youkuMatch[1].length) {
                $video = $("<iframe webkitallowfullscreen mozallowfullscreen allowfullscreen>")
                    .attr("frameborder", 0)
                    .attr("height", "498")
                    .attr("width", "510")
                    .attr("src", "//player.youku.com/embed/" + youkuMatch[1]);
            } else if (mp4Match || oggMatch || webmMatch) {
                $video = $("<video controls>")
                    .attr("src", url)
                    .attr("width", "640").attr("height", "360");
            } else {
                // this is not a known video link. Now what, Cat? Now what?
                return false;
            }

            $video.addClass("note-video-clip");

            return $video[0];
        };

        this.show = function() {
            var text = context.invoke("editor.getSelectedText");
            context.invoke("editor.saveRange");
            this.showVideoDialog(text).then(function(url) {
                // [workaround] hide dialog before restore range for IE range focus
                ui.hideDialog(self.$dialog);
                context.invoke("editor.restoreRange");

                // build node
                var $node = self.createVideoNode(url);

                if ($node) {
                    // insert video node
                    context.invoke("editor.insertNode", $node);
                }
            }).fail(function() {
                context.invoke("editor.restoreRange");
            });
        };

        /**
         * show image dialog
         *
         * @param {jQuery} $dialog
         * @return {Promise}
         */
        this.showVideoDialog = function(text) {
            return $.Deferred(function(deferred) {
                var $videoUrl = self.$dialog.find(".note-video-url"),
                    $videoBtn = self.$dialog.find(".note-video-btn");

                ui.onDialogShown(self.$dialog,
                    function() {
                        context.triggerEvent("dialog.shown");

                        $videoUrl.val(text).on("input",
                            function() {
                                ui.toggleBtn($videoBtn, $videoUrl.val());
                            }).trigger("focus");

                        $videoBtn.click(function(event) {
                            event.preventDefault();

                            deferred.resolve($videoUrl.val());
                        });

                        self.bindEnterKey($videoUrl, $videoBtn);
                    });

                ui.onDialogHidden(self.$dialog,
                    function() {
                        $videoUrl.off("input");
                        $videoBtn.off("click");

                        if (deferred.state() === "pending") {
                            deferred.reject();
                        }
                    });

                ui.showDialog(self.$dialog);
            });
        };
    };

    var HelpDialog = function(context) {
        var self = this;
        var ui = $.summernote.ui;

        var $editor = context.layoutInfo.editor;
        var options = context.options;
        var lang = options.langInfo;

        this.createShortCutList = function() {
            var keyMap = options.keyMap[agent.isMac ? "mac" : "pc"];
            return Object.keys(keyMap).map(function(key) {
                var command = keyMap[key];
                var $row = $('<div><div class="help-list-item"/></div>');
                $row.append($("<label><kbd>" + key + "</kdb></label>").css({
                    'width': 180,
                    'margin-right': 10
                })).append($("<span/>").html(context.memo("help." + command) || command));
                return $row.html();
            }).join("");
        };

        this.initialize = function() {
            var $container = options.dialogsInBody ? $(document.body) : $editor;

            var body = [
                '<p class="text-center">',
                '<a href="//summernote.org/" target="_blank">Summernote 0.8.1</a> · ',
                '<a href="//github.com/summernote/summernote" target="_blank">Project</a> · ',
                '<a href="//github.com/summernote/summernote/issues" target="_blank">Issues</a>',
                "</p>"
            ].join("");

            this.$dialog = ui.dialog({
                title: lang.options.help,
                fade: options.dialogsFade,
                body: this.createShortCutList(),
                footer: body,
                callback: function($node) {
                    $node.find(".modal-body").css({
                        'max-height': 300,
                        'overflow': "scroll"
                    });
                }
            }).render().appendTo($container);
        };

        this.destroy = function() {
            ui.hideDialog(this.$dialog);
            this.$dialog.remove();
        };

        /**
         * show help dialog
         *
         * @return {Promise}
         */
        this.showHelpDialog = function() {
            return $.Deferred(function(deferred) {
                ui.onDialogShown(self.$dialog,
                    function() {
                        context.triggerEvent("dialog.shown");
                        deferred.resolve();
                    });
                ui.showDialog(self.$dialog);
            }).promise();
        };

        this.show = function() {
            context.invoke("editor.saveRange");
            this.showHelpDialog().then(function() {
                context.invoke("editor.restoreRange");
            });
        };
    };

    var AirPopover = function(context) {
        var self = this;
        var ui = $.summernote.ui;

        var options = context.options;

        var AIR_MODE_POPOVER_X_OFFSET = 20;

        this.events = {
            'summernote.keyup summernote.mouseup summernote.scroll': function() {
                self.update();
            },
            'summernote.change summernote.dialog.shown': function() {
                self.hide();
            },
            'summernote.focusout': function(we, e) {
                // [workaround] Firefox doesn't support relatedTarget on focusout
                //  - Ignore hide action on focus out in FF.
                if (agent.isFF) {
                    return;
                }

                if (!e.relatedTarget || !dom.ancestor(e.relatedTarget, func.eq(self.$popover[0]))) {
                    self.hide();
                }
            }
        };

        this.shouldInitialize = function() {
            return options.airMode && !list.isEmpty(options.popover.air);
        };

        this.initialize = function() {
            this.$popover = ui.popover({
                className: "note-air-popover"
            }).render().appendTo("body");
            var $content = this.$popover.find(".popover-content");

            context.invoke("buttons.build", $content, options.popover.air);
        };

        this.destroy = function() {
            this.$popover.remove();
        };

        this.update = function() {
            var styleInfo = context.invoke("editor.currentStyle");
            if (styleInfo.range && !styleInfo.range.isCollapsed()) {
                var rect = list.last(styleInfo.range.getClientRects());
                if (rect) {
                    var bnd = func.rect2bnd(rect);
                    this.$popover.css({
                        display: "block",
                        left: Math.max(bnd.left + bnd.width / 2, 0) - AIR_MODE_POPOVER_X_OFFSET,
                        top: bnd.top + bnd.height
                    });
                }
            } else {
                this.hide();
            }
        };

        this.hide = function() {
            this.$popover.hide();
        };
    };

    var HintPopover = function(context) {
        var self = this;
        var ui = $.summernote.ui;

        var POPOVER_DIST = 5;
        var hint = context.options.hint || [];
        var direction = context.options.hintDirection || "bottom";
        var hints = $.isArray(hint) ? hint : [hint];

        this.events = {
            'summernote.keyup': function(we, e) {
                if (!e.isDefaultPrevented()) {
                    self.handleKeyup(e);
                }
            },
            'summernote.keydown': function(we, e) {
                self.handleKeydown(e);
            },
            'summernote.dialog.shown': function() {
                self.hide();
            }
        };

        this.shouldInitialize = function() {
            return hints.length > 0;
        };

        this.initialize = function() {
            this.lastWordRange = null;
            this.$popover = ui.popover({
                className: "note-hint-popover",
                hideArrow: true,
                direction: ""
            }).render().appendTo("body");

            this.$popover.hide();

            this.$content = this.$popover.find(".popover-content");

            this.$content.on("click",
                ".note-hint-item",
                function() {
                    self.$content.find(".active").removeClass("active");
                    $(this).addClass("active");
                    self.replace();
                });
        };

        this.destroy = function() {
            this.$popover.remove();
        };

        this.selectItem = function($item) {
            this.$content.find(".active").removeClass("active");
            $item.addClass("active");

            this.$content[0].scrollTop = $item[0].offsetTop - (this.$content.innerHeight() / 2);
        };

        this.moveDown = function() {
            var $current = this.$content.find(".note-hint-item.active");
            var $next = $current.next();

            if ($next.length) {
                this.selectItem($next);
            } else {
                var $nextGroup = $current.parent().next();

                if (!$nextGroup.length) {
                    $nextGroup = this.$content.find(".note-hint-group").first();
                }

                this.selectItem($nextGroup.find(".note-hint-item").first());
            }
        };

        this.moveUp = function() {
            var $current = this.$content.find(".note-hint-item.active");
            var $prev = $current.prev();

            if ($prev.length) {
                this.selectItem($prev);
            } else {
                var $prevGroup = $current.parent().prev();

                if (!$prevGroup.length) {
                    $prevGroup = this.$content.find(".note-hint-group").last();
                }

                this.selectItem($prevGroup.find(".note-hint-item").last());
            }
        };

        this.replace = function() {
            var $item = this.$content.find(".note-hint-item.active");

            if ($item.length) {
                var node = this.nodeFromItem($item);
                this.lastWordRange.insertNode(node);
                range.createFromNode(node).collapse().select();

                this.lastWordRange = null;
                this.hide();
                context.invoke("editor.focus");
            }

        };

        this.nodeFromItem = function($item) {
            var hint = hints[$item.data("index")];
            var item = $item.data("item");
            var node = hint.content ? hint.content(item) : item;
            if (typeof node === "string") {
                node = dom.createText(node);
            }
            return node;
        };

        this.createItemTemplates = function(hintIdx, items) {
            var hint = hints[hintIdx];
            return items.map(function(item, idx) {
                var $item = $('<div class="note-hint-item"/>');
                $item.append(hint.template ? hint.template(item) : item + "");
                $item.data({
                    'index': hintIdx,
                    'item': item
                });

                if (hintIdx === 0 && idx === 0) {
                    $item.addClass("active");
                }
                return $item;
            });
        };

        this.handleKeydown = function(e) {
            if (!this.$popover.is(":visible")) {
                return;
            }

            if (e.keyCode === key.code.ENTER) {
                e.preventDefault();
                this.replace();
            } else if (e.keyCode === key.code.UP) {
                e.preventDefault();
                this.moveUp();
            } else if (e.keyCode === key.code.DOWN) {
                e.preventDefault();
                this.moveDown();
            }
        };

        this.searchKeyword = function(index, keyword, callback) {
            var hint = hints[index];
            if (hint && hint.match.test(keyword) && hint.search) {
                var matches = hint.match.exec(keyword);
                hint.search(matches[1], callback);
            } else {
                callback();
            }
        };

        this.createGroup = function(idx, keyword) {
            var $group = $('<div class="note-hint-group note-hint-group-' + idx + '"/>');
            this.searchKeyword(idx,
                keyword,
                function(items) {
                    items = items || [];
                    if (items.length) {
                        $group.html(self.createItemTemplates(idx, items));
                        self.show();
                    }
                });

            return $group;
        };

        this.handleKeyup = function(e) {
            if (list.contains([key.code.ENTER, key.code.UP, key.code.DOWN], e.keyCode)) {
                if (e.keyCode === key.code.ENTER) {
                    if (this.$popover.is(":visible")) {
                        return;
                    }
                }
            } else {
                var wordRange = context.invoke("editor.createRange").getWordRange();
                var keyword = wordRange.toString();
                if (hints.length && keyword) {
                    this.$content.empty();

                    var bnd = func.rect2bnd(list.last(wordRange.getClientRects()));
                    if (bnd) {

                        this.$popover.hide();

                        this.lastWordRange = wordRange;

                        hints.forEach(function(hint, idx) {
                            if (hint.match.test(keyword)) {
                                self.createGroup(idx, keyword).appendTo(self.$content);
                            }
                        });

                        // set position for popover after group is created
                        if (direction === "top") {
                            this.$popover.css({
                                left: bnd.left,
                                top: bnd.top - this.$popover.outerHeight() - POPOVER_DIST
                            });
                        } else {
                            this.$popover.css({
                                left: bnd.left,
                                top: bnd.top + bnd.height + POPOVER_DIST
                            });
                        }

                    }
                } else {
                    this.hide();
                }
            }
        };

        this.show = function() {
            this.$popover.show();
        };

        this.hide = function() {
            this.$popover.hide();
        };
    };


    $.summernote = $.extend($.summernote,
        {
            version: "0.8.1",
            ui: ui,

            plugins: {},

            options: {
                modules: {
                    'editor': Editor,
                    'clipboard': Clipboard,
                    'dropzone': Dropzone,
                    'codeview': Codeview,
                    'statusbar': Statusbar,
                    'fullscreen': Fullscreen,
                    'handle': Handle,
                    // FIXME: HintPopover must be front of autolink
                    //  - Script error about range when Enter key is pressed on hint popover
                    'hintPopover': HintPopover,
                    'autoLink': AutoLink,
                    'autoSync': AutoSync,
                    'placeholder': Placeholder,
                    'buttons': Buttons,
                    'toolbar': Toolbar,
                    'linkDialog': LinkDialog,
                    'linkPopover': LinkPopover,
                    'imageDialog': ImageDialog,
                    'imagePopover': ImagePopover,
                    'videoDialog': VideoDialog,
                    'helpDialog': HelpDialog,
                    'airPopover': AirPopover
                },

                buttons: {},

                lang: "en-US",

                // toolbar
                toolbar: [
                    ["style", ["style"]],
                    ["font", ["bold", "underline", "clear"]],
                    ["fontname", ["fontname"]],
                    ["color", ["color"]],
                    ["para", ["ul", "ol", "paragraph"]],
                    ["table", ["table"]],
                    ["insert", ["link", "picture", "video"]],
                    ["view", ["fullscreen", "codeview", "help"]]
                ],

                // popover
                popover: {
                    image: [
                        ["imagesize", ["imageSize100", "imageSize50", "imageSize25"]],
                        ["float", ["floatLeft", "floatRight", "floatNone"]],
                        ["remove", ["removeMedia"]]
                    ],
                    link: [
                        ["link", ["linkDialogShow", "unlink"]]
                    ],
                    air: [
                        ["color", ["color"]],
                        ["font", ["bold", "underline", "clear"]],
                        ["para", ["ul", "paragraph"]],
                        ["table", ["table"]],
                        ["insert", ["link", "picture"]]
                    ]
                },

                // air mode: inline editor
                airMode: false,

                width: null,
                height: null,

                focus: false,
                tabSize: 4,
                styleWithSpan: true,
                shortcuts: true,
                textareaAutoSync: true,
                direction: null,

                styleTags: ["p", "blockquote", "pre", "h1", "h2", "h3", "h4", "h5", "h6"],

                fontNames: [
                    "Arial", "Arial Black", "Comic Sans MS", "Courier New",
                    "Helvetica Neue", "Helvetica", "Impact", "Lucida Grande",
                    "Tahoma", "Times New Roman", "Verdana"
                ],

                fontSizes: ["8", "9", "10", "11", "12", "14", "18", "24", "36"],

                // pallete colors(n x n)
                colors: [
                    ["#000000", "#424242", "#636363", "#9C9C94", "#CEC6CE", "#EFEFEF", "#F7F7F7", "#FFFFFF"],
                    ["#FF0000", "#FF9C00", "#FFFF00", "#00FF00", "#00FFFF", "#0000FF", "#9C00FF", "#FF00FF"],
                    ["#F7C6CE", "#FFE7CE", "#FFEFC6", "#D6EFD6", "#CEDEE7", "#CEE7F7", "#D6D6E7", "#E7D6DE"],
                    ["#E79C9C", "#FFC69C", "#FFE79C", "#B5D6A5", "#A5C6CE", "#9CC6EF", "#B5A5D6", "#D6A5BD"],
                    ["#E76363", "#F7AD6B", "#FFD663", "#94BD7B", "#73A5AD", "#6BADDE", "#8C7BC6", "#C67BA5"],
                    ["#CE0000", "#E79439", "#EFC631", "#6BA54A", "#4A7B8C", "#3984C6", "#634AA5", "#A54A7B"],
                    ["#9C0000", "#B56308", "#BD9400", "#397B21", "#104A5A", "#085294", "#311873", "#731842"],
                    ["#630000", "#7B3900", "#846300", "#295218", "#083139", "#003163", "#21104A", "#4A1031"]
                ],

                lineHeights: ["1.0", "1.2", "1.4", "1.5", "1.6", "1.8", "2.0", "3.0"],

                tableClassName: "table table-bordered",

                insertTableMaxSize: {
                    col: 10,
                    row: 10
                },

                dialogsInBody: false,
                dialogsFade: false,

                maximumImageFileSize: null,

                callbacks: {
                    onInit: null,
                    onFocus: null,
                    onBlur: null,
                    onEnter: null,
                    onKeyup: null,
                    onKeydown: null,
                    onSubmit: null,
                    onImageUpload: null,
                    onImageUploadError: null
                },

                codemirror: {
                    mode: "text/html",
                    htmlMode: true,
                    lineNumbers: true
                },

                keyMap: {
                    pc: {
                        'ENTER': "insertParagraph",
                        'CTRL+Z': "undo",
                        'CTRL+Y': "redo",
                        'TAB': "tab",
                        'SHIFT+TAB': "untab",
                        'CTRL+B': "bold",
                        'CTRL+I': "italic",
                        'CTRL+U': "underline",
                        'CTRL+SHIFT+S': "strikethrough",
                        'CTRL+BACKSLASH': "removeFormat",
                        'CTRL+SHIFT+L': "justifyLeft",
                        'CTRL+SHIFT+E': "justifyCenter",
                        'CTRL+SHIFT+R': "justifyRight",
                        'CTRL+SHIFT+J': "justifyFull",
                        'CTRL+SHIFT+NUM7': "insertUnorderedList",
                        'CTRL+SHIFT+NUM8': "insertOrderedList",
                        'CTRL+LEFTBRACKET': "outdent",
                        'CTRL+RIGHTBRACKET': "indent",
                        'CTRL+NUM0': "formatPara",
                        'CTRL+NUM1': "formatH1",
                        'CTRL+NUM2': "formatH2",
                        'CTRL+NUM3': "formatH3",
                        'CTRL+NUM4': "formatH4",
                        'CTRL+NUM5': "formatH5",
                        'CTRL+NUM6': "formatH6",
                        'CTRL+ENTER': "insertHorizontalRule",
                        'CTRL+K': "linkDialog.show"
                    },

                    mac: {
                        'ENTER': "insertParagraph",
                        'CMD+Z': "undo",
                        'CMD+SHIFT+Z': "redo",
                        'TAB': "tab",
                        'SHIFT+TAB': "untab",
                        'CMD+B': "bold",
                        'CMD+I': "italic",
                        'CMD+U': "underline",
                        'CMD+SHIFT+S': "strikethrough",
                        'CMD+BACKSLASH': "removeFormat",
                        'CMD+SHIFT+L': "justifyLeft",
                        'CMD+SHIFT+E': "justifyCenter",
                        'CMD+SHIFT+R': "justifyRight",
                        'CMD+SHIFT+J': "justifyFull",
                        'CMD+SHIFT+NUM7': "insertUnorderedList",
                        'CMD+SHIFT+NUM8': "insertOrderedList",
                        'CMD+LEFTBRACKET': "outdent",
                        'CMD+RIGHTBRACKET': "indent",
                        'CMD+NUM0': "formatPara",
                        'CMD+NUM1': "formatH1",
                        'CMD+NUM2': "formatH2",
                        'CMD+NUM3': "formatH3",
                        'CMD+NUM4': "formatH4",
                        'CMD+NUM5': "formatH5",
                        'CMD+NUM6': "formatH6",
                        'CMD+ENTER': "insertHorizontalRule",
                        'CMD+K': "linkDialog.show"
                    }
                },
                icons: {
                    'align': "note-icon-align",
                    'alignCenter': "note-icon-align-center",
                    'alignJustify': "note-icon-align-justify",
                    'alignLeft': "note-icon-align-left",
                    'alignRight': "note-icon-align-right",
                    'indent': "note-icon-align-indent",
                    'outdent': "note-icon-align-outdent",
                    'arrowsAlt': "note-icon-arrows-alt",
                    'bold': "note-icon-bold",
                    'caret': "note-icon-caret",
                    'circle': "note-icon-circle",
                    'close': "note-icon-close",
                    'code': "note-icon-code",
                    'eraser': "note-icon-eraser",
                    'font': "note-icon-font",
                    'frame': "note-icon-frame",
                    'italic': "note-icon-italic",
                    'link': "note-icon-link",
                    'unlink': "note-icon-chain-broken",
                    'magic': "note-icon-magic",
                    'menuCheck': "note-icon-check",
                    'minus': "note-icon-minus",
                    'orderedlist': "note-icon-orderedlist",
                    'pencil': "note-icon-pencil",
                    'picture': "note-icon-picture",
                    'question': "note-icon-question",
                    'redo': "note-icon-redo",
                    'square': "note-icon-square",
                    'strikethrough': "note-icon-strikethrough",
                    'subscript': "note-icon-subscript",
                    'superscript': "note-icon-superscript",
                    'table': "note-icon-table",
                    'textHeight': "note-icon-text-height",
                    'trash': "note-icon-trash",
                    'underline': "note-icon-underline",
                    'undo': "note-icon-undo",
                    'unorderedlist': "note-icon-unorderedlist",
                    'video': "note-icon-video"
                }
            }
        });

}));
